Introduction Cells and tissues are among the most important biological evidence collected from crime scenes. They contain valuable biological information that can be used to reconstruct criminal events and link individuals to crimes. Forensic science relies heavily on cellular and tissue analysis. Types of Cellular and Tissue Evidence Such evidence includes: Skin cells from touch Bloodstains Tissue fragments Hair with roots These materials may be found on clothing, weapons, or surfaces. Collection and Preservation Methods The value of cellular evidence depends on proper collection and preservation, including: Preventing contamination Using sterile tools Maintaining appropriate storage conditions Improper handling may destroy evidence. Role of Cellular Analysis in Crime Reconstruction Cell and tissue analysis helps to: Identify individuals Determine injury types Link weapons to crimes Support DNA findings Thus, it plays a vital role in reconstructing crimes. Legal and Forensic Value Cellular evidence is highly reliable due to its scientific basis and is often decisive in cases lacking eyewitnesses. Conclusion Cells and tissues serve as a bridge between life sciences and forensic investigations, making them essential tools in uncovering criminal truth. Al-Mustaqbal University – the first university in Iraq.