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Determining Tampers / Adulterations

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If the donor attempts to tamper with the patch by applying a substance to its exterior, the film will lose its shiny, smooth, and transparent qualities. Should the donor try to manipulate the patch by injecting a caustic substance beneath the patch’s outer film, several indicators may be evident. The absorbent pad might show discoloration and emit an odor, the skin under the pad could become irritated and red, and puncture marks from a hypodermic needle may be visible on the film.

In cases where you suspect that a patch has been tampered with or is compromised, record your observations in box #17 on the chain of custody form. This acts as a record in the event the patch is unsuitable for analysis or yields unexpected results.

Adulterated Patch. Pad injected with 30% peroxide and disintegrated.
Adulterated Patch. Caustic substance injected into the pad, causing severe skin irritation.
Adulterated Patch. Significant break-down of the film. The pad is nearly disintegrated, the skin under the film is red, and appears blistered. “Odor of vinegar” noted at removal.
Neither the monitoring agency, nor the client may add to or detract from the construction of the Sweat Patch at any time.
Adulterated Patch. Subsequent environmental testing revealed the patch was injected with a substance known as “Galaxolide,” which is a liquid used by cologne manufacturers to create a woody-musky scent. [Client injected the pad with cologne in an attempt to mask a positive patch result, and tried claim that he was “allergic” to the patch].

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