Evidence Script (DNA) QBCore - Advanced Forensic Investigation System

Revolutionize criminal investigations on your QBCore server with this comprehensive DNA and Evidence Collection System that brings realistic forensic science to law enforcement roleplay. This sophisticated script allows police detectives to collect DNA samples from crime scenes, match evidence to suspects through database searches, build prosecutable cases with scientific evidence, and maintain chain of custody for courtroom proceedings. Perfect for serious roleplay servers where investigations require more than simply catching criminals - now officers must prove guilt through forensic evidence that transforms police work from chases to detective work.

What's Included

This forensic system provides complete evidence collection and analysis infrastructure including DNA sample collection from crime scenes, bodies, and suspects, fingerprint gathering from surfaces and items, ballistic evidence linking bullets to weapons, blood spatter analysis, evidence storage with proper chain of custody tracking, and a forensic database that matches collected evidence to potential suspects. Police can collect samples, send them to the crime lab for processing, receive analysis results, and build cases with multiple pieces of corroborating evidence.

The system includes evidence bags for proper sample storage, crime scene markers for documenting evidence locations, photography tools for capturing scene documentation, evidence lockers for secure storage at police stations, and comprehensive logs showing who collected evidence, when it was processed, and which cases it belongs to. Defense attorneys can challenge evidence if chain of custody is broken, creating realistic courtroom dynamics.

Key Features

• DNA Collection - Gather DNA samples from blood stains, saliva, skin cells, or bodies at crime scenes using swab kits and proper forensic procedures
• DNA Database Matching - Collected DNA automatically searches the criminal database for matches to known offenders or previous crime scenes
• Fingerprint Analysis - Dust surfaces for fingerprints, lift prints using tape, and match them to suspects in the fingerprint database
• Ballistic Evidence - Collect bullet casings that retain data about the weapon used, allowing detectives to link multiple crime scenes to the same gun
• Blood Spatter Analysis - Blood stains persist at crime scenes with realistic textures, providing DNA evidence and visual crime scene recreation
• Evidence Bags & Labeling - Properly package evidence in marked bags with case numbers, collection time/date, and officer information for organization
• Chain of Custody - Track every person who handles evidence from collection through analysis to courtroom presentation, preventing contamination claims
• Crime Lab Processing - Send evidence to forensic technicians for analysis, with processing times creating realistic delays before results arrive
• Evidence Storage - Secure evidence lockers at police stations organize samples by case number, preventing evidence loss or tampering
• Database Integration - Automated searches match collected DNA/fingerprints to anyone in the police database (arrested players with samples on file)
• Suspect DNA Collection - Book suspects and collect their DNA/fingerprints during processing, adding them to the searchable database
• Multi-Evidence Cases - Build comprehensive investigations with multiple pieces of evidence from different sources corroborating the same conclusion
• Court Admissibility - Properly collected and documented evidence becomes admissible in court RP, with improper handling allowing defense challenges
• Detective Tools - Evidence collection kits, UV lights for finding biological fluids, fingerprint powder, evidence markers, and camera for documentation

Perfect For

• Serious Roleplay Servers - Communities emphasizing realistic police investigations rather than shoot-first enforcement
• Detective Departments - Servers with dedicated investigation units need forensic tools beyond basic police equipment
• Court Roleplay Servers - Legal systems requiring evidence for convictions benefit from scientific proof rather than officer testimony alone
• Criminal Justice Focus - Servers building comprehensive justice systems from crime to investigation to prosecution to sentencing
• Competitive Criminal Gameplay - Smart criminals learn to avoid leaving evidence, creating cat-and-mouse dynamics with police
• Government Structure Servers - Well-organized communities with distinct police, forensic, and legal departments working together

Investigation Workflow

Crime Scene Response: Officers respond to reported crimes (shootings, robberies, assaults) and secure the scene. Detectives arrive with evidence collection kits containing swabs, evidence bags, fingerprint powder, markers, and cameras. They systematically search the area for evidence - blood stains indicate violence locations, bullet casings show shooter positions, and touched surfaces may contain fingerprints.

Evidence Collection: Using specialized tools, detectives collect samples. DNA swabs gather biological material from blood or saliva. Fingerprint powder reveals prints on doorknobs, weapons, or surfaces. Bullet casings are bagged with notes about location. Each piece of evidence is photographed in place before collection, creating scene documentation. Evidence bags are labeled with case numbers, item descriptions, collection time, and the collecting officer's name.

Lab Processing: Collected evidence goes to the crime lab (either a dedicated forensic technician role or automated processing). DNA samples undergo analysis comparing genetic markers to the database. Fingerprints are scanned and matched against known prints. Ballistics analysis determines weapon type from casing markings. Processing takes time (configurable, typically 10-30 minutes real-time), creating realistic delays.

Results & Investigation: Analysis results identify potential suspects by matching DNA/fingerprints to database entries. If a match is found, detectives receive the suspect's name and previous offenses. Multiple evidence pieces pointing to the same person strengthen the case. If no match exists, the evidence is stored until a suspect is arrested and their DNA added to the database, potentially linking them to old cases.

Building the Case: Detectives compile evidence into case files showing all collected items, analysis results, matching suspects, and chain of custody documentation. Strong cases with multiple evidence types (DNA + fingerprints + ballistics) provide overwhelming proof for prosecution. Weak cases with single evidence points may require additional investigation or witness testimony.

DNA Collection Mechanics

DNA evidence appears at crime scenes where violence occurred. Blood stains spawn when players are injured or killed, persisting for configured durations (typically 30-60 minutes). Detectives use UV lights to reveal otherwise invisible biological evidence. DNA swabs collect samples that automatically capture the victim/criminal's identifier, linking evidence to specific players.

When suspects are arrested and processed, police collect reference DNA samples that populate the searchable database. Future crime scene DNA automatically compares against this database. If a match exists, detectives receive instant notification: DNA matches [Suspect Name], previously arrested for [crimes]. This creates investigative leads without requiring officers to guess perpetrators.

Technical Specifications

• Framework: QBCore (qb-core) - specifically designed for QBCore police systems
• Database: MySQL tables for evidence samples, DNA database, fingerprint records, and case files
• Performance: Optimized code with minimal resource usage (0.01-0.02 ms resmon)
• Evidence Persistence: Crime scene evidence persists for configurable durations (blood stains, casings, etc.)
• Processing Time: Configurable lab analysis delays (instant to 60+ minutes) for realism
• Database Capacity: Stores unlimited DNA/fingerprint records and evidence samples
• Job Restriction: Evidence collection restricted to police jobs (configurable ranks/departments)
• Chain of Custody: Full logging of evidence handling from collection to court presentation
• UI: Modern interfaces for evidence collection, lab processing, and database searches
• Evidence Types: DNA, fingerprints, ballistics, blood spatter, and custom evidence types

Installation

1. Download the Evidence Script (DNA) QBCore package from your purchase confirmation
2. Extract the resource folder to your FiveM server's resources directory
3. Import the provided SQL file to create evidence database tables
4. Configure evidence settings in config.lua (processing times, persistence durations, job restrictions)
5. Ensure QBCore framework and qb-policejob are properly installed and functioning
6. Add ensure evidence-dna-system (or provided resource name) to server.cfg
7. Set up evidence locker locations at police stations for storage
8. Configure which police ranks can collect evidence (detectives, CSI, all officers, etc.)
9. Restart server and test evidence collection, processing, and database matching
10. Optionally integrate with court scripts for evidence presentation during trials

Framework Compatibility

• ✅ QBCore - Specifically designed for qb-core framework with full integration to police job systems
• ✅ qb-policejob - Works seamlessly with standard QBCore police job for evidence access and permissions
• ✅ qb-inventory - Evidence items integrate with QBCore inventory for collection kits and evidence bags
• ✅ qb-target - Uses targeting system for evidence collection from objects and bodies
• ✅ Court Scripts - Evidence exports can integrate with court/legal scripts for trial proceedings
• ❌ ESX - Designed specifically for QBCore, not compatible with ESX without significant conversion

Evidence Types Explained

DNA Evidence: Most powerful evidence type as it uniquely identifies individuals. Found in blood, saliva, skin cells. Provides definitive suspect identification if they're in the database. Cannot be faked or planted without admin intervention, ensuring integrity.

Fingerprints: Common evidence found on touched surfaces - door handles, weapon grips, steering wheels. Not as unique as DNA but still provides strong identification. Smart criminals wear gloves to avoid leaving prints.

Ballistic Evidence: Bullet casings retain weapon signatures. Allows linking multiple crime scenes to the same gun even if shooter isn't identified. Helps establish patterns and build cases against armed criminals.

Blood Spatter: Visual evidence showing violence locations, impact patterns, and blood trails. Provides DNA while also documenting crime scene dynamics for reconstruction.

Smart Criminal Counterplay

Sophisticated criminals adapt to forensic science by wearing gloves to avoid fingerprints, using cleaning supplies to remove blood evidence, collecting their own bullet casings after shootouts, and avoiding DNA-registry offenses to stay out of the database. This creates gameplay depth where professional criminals operate more carefully than reckless street thugs, requiring more sophisticated detective work to catch.

Police must adapt by getting suspects to voluntarily provide DNA (through arrests for minor offenses), investigating associates of database-negative criminals, or building circumstantial cases when forensic evidence is unavailable.

What Makes It Stand Out

This evidence system transforms police roleplay from action-focused pursuits to investigation-driven detective work. Officers can't simply arrest anyone they suspect - they need proof. The DNA database creates long-term consequences for criminal behavior as old unsolved cases suddenly become solvable when suspects are finally arrested and added to the system.

Chain of custody mechanics prevent lazy evidence handling - losing track of evidence or failing to document properly can result in case dismissal during court proceedings. The processing time delay creates realistic pacing where investigations take hours or days rather than instant results. Integration with QBCore systems ensures evidence works seamlessly with existing police, inventory, and job frameworks.

Roleplay Enhancement

Forensic evidence creates rich roleplay opportunities beyond mechanical benefits. Detectives become specialists with investigative expertise. Crime scene investigations become collaborative efforts between patrol officers, detectives, and forensic technicians. Defense attorneys can challenge evidence collection procedures, creating courtroom drama. Criminals must think strategically about evidence rather than just avoiding capture in the moment.

The system rewards methodical police work - thorough crime scene processing yields more evidence than rushing through scenes. Patient investigations that wait for lab results often solve cases that seemed initially unsolvable. Smart case-building with multiple evidence types creates prosecutions that withstand legal challenges.

Configuration Flexibility

Extensive configuration options adapt the system to different server styles. Serious RP servers set long processing times (30-60 minutes) for realism. Faster-paced servers use instant or 5-minute processing. Configure evidence persistence - blood stains can last 10 minutes for cleanup urgency or 60+ minutes for detailed investigations. Adjust which jobs can collect evidence - restrict to detectives only or allow all police. Set database auto-matching or require manual searches. Enable/disable specific evidence types based on preferences.

Administrative Oversight

Admins can view all evidence in the system, manually add/remove database entries for special scenarios, clear old evidence to maintain database performance, and monitor evidence collection for potential abuse. Logs track every evidence interaction for dispute resolution. The system maintains integrity through server-side validation while giving admins tools to manage edge cases.

Elevate your QBCore server's law enforcement roleplay with a forensic evidence system that makes criminal investigations feel like real detective work, where solving crimes requires brains, patience, and scientific proof.

Related FiveM Police Scripts

• GPS System (Emergency GPS)
• QBCore Framework Server (QB v4)
• Humane Labs Heist (QBCore)
• Real Handcuffs