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What is evidence mishandling and how can it affect drug charges?

On Behalf of | May 20, 2025 | Drug Charges

Evidence mishandling in drug cases occurs when law enforcement, forensic technicians or prosecutors improperly collect, store, analyze or present evidence used to support criminal charges against you. These errors can range from simple negligence to intentional misconduct, potentially compromising the integrity of evidence critical to proving guilt beyond reasonable doubt.

When you face drug distribution charges, the prosecution’s case often relies heavily on physical evidence such as seized substances, packaging materials, scales and cash. If any of this evidence has been compromised through mishandling, you may have strong grounds for challenging the charges against you. 

What are the different types of evidence mishandling?

Evidence mishandling takes various forms throughout the criminal justice process, each potentially creating opportunities to challenge drug charges:

  • Improper field testing: Police officers frequently use presumptive field test kits that can produce false positives for illegal substances. These unreliable tests have mistakenly identified everything from donut glaze to baking soda as controlled substances, yet are often treated as definitive evidence.
  • Broken chain of custody: Every time evidence changes hands, documentation must verify who possessed it, when and under what conditions. When this chain breaks through missing signatures, improper transfers or gaps in documentation, evidence integrity becomes questionable.
  • Cross-contamination: Drug evidence stored improperly can become contaminated through contact with other substances. This is particularly problematic in laboratories processing numerous drug samples simultaneously, where trace amounts can transfer between unrelated cases.
  • Laboratory errors: Forensic analysts may use improper testing procedures, misinterpret results or make calculation errors when determining substance identity or weight. Many crime labs face excessive backlogs and pressure to process cases quickly, increasing error rates.
  • Quantitative analysis problems: The weight of seized drugs directly impacts charging decisions and potential sentences. Improper weighing procedures, including weighing packaging materials with substances or failing to account for moisture content, can artificially inflate reported amounts.

Evidence mishandling provides multiple avenues to challenge drug charges. When properly identified, these issues can lead to evidence suppression, case dismissal or acquittal at trial. Seeking legal guidance can help identify potential evidence mishandling issues that could significantly impact the outcome of your case.