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Last modified: February 2026
Test Strip Issues and Reporting
Like any product, immunoassay test strips can sometimes be faulty or affected by manufacturing issues. Unlike most product problems, however, errors with test strips can have serious consequences. People rely on these tools to make informed decisions and reduce risk, so accuracy matters.
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This page shares resources and guidance about reporting faulty or adverse test strip events. Tracking performance and following clear response steps helps ensure results are used safely, responsibly, and transparently in drug checking and harm reduction programs.
Are you a Massachusetts drug checking site and having test strip issues?
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Report a Test Strip Issue
If you are a person who uses drugs or a drug checking service provider and have recently encountered a strange or faulty result using immunoassay test strips, please fill out the below submission form so that the StreetCheck team can look into your concerns.
Before you start
Please set aside your test strip, as upon review, our team may advise you to mail the strip for further analysis.
Have you checked for test strip cross-reactivity? Click here to view common test strip problems
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Resources and Publications
Generalized Test Strip and Guidance Resources:
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Remedy Alliance For the People's Biweekly Test Strip Office Hours​
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​Harvard Law School's Center for Health Policy and Law Innovation's Drug Testing FAQ
Benzodiazepine Test Strips:
Fentanyl Test Strips:
Medetomidine Test Strips:
Nitazene Test Strips:
Xylazine Test Strips:
