Defendant on supervised release for meth distribution tested positive across six PharmChek sweat patches. Court upheld only 2 of 7 violations — the rest were dismissed due to probation officers failing to document patch condition upon removal, missing chain-of-custody forms, and improper barcode labeling. Highlights that procedural thoroughness, not just positive test results, determines admissibility.

US-v-Boonchan-Yang-Dist-of-Alaska-2021.pdf