[Application of Touch DNA in Investigation Practice]

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• DNA evidence is vital in criminal investigations for suspect identification.
• Increasing criminal sophistication leads to reduced traditional evidence.
• Touch DNA has become increasingly important due to its prevalence at crime scenes.

Purpose of the Study:

• To review various types of touch DNA evidence.
• To discuss methods for collecting and extracting touch DNA.
• To identify factors affecting touch DNA detection and associated challenges.

Main Methods:

• Literature review of touch DNA studies.
• Analysis of collection and extraction techniques.
• Examination of factors influencing DNA detection and degradation.

Main Results:

• Touch DNA is often present in minute quantities and difficult to detect.
• Environmental contamination accelerates the degradation of trace DNA evidence.
• Effective collection and analysis are critical for successful identification.

Conclusions:

• Touch DNA analysis presents significant challenges in forensic science.
• Improved methods for detection and analysis are needed.
• This review provides insights for forensic practice and future research.