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(dark blue)

(dark blue)

(dark blue)

(dark blue)

(blue)

(blue)

(blue)

(very light blue)

(slight tint of blue)

Creatinine, Glutaraldehyde, pH and Specific Gravity were normal in all groups and are not listed in this table. PCC, pyridinium chlorochromate.

diately after addition of the adulterants and lasted for at least 3-8 h. Thus, the presence of the adulterants Urine Luck and Stealth could be detected during the earlier time points. Unexpectedly, as the tests proceeded, the dark blue coloration in the nitrite tests became lighter and lighter, and exhibited normal coloration by 3 h in the Stealth group and by 8 h in the Urine Luck group. Similar color lightening was observed for the bleach and PCC tests, although the kinetic was much slower. Significantly, the lightening of color in these two tests continued, and by 24 h after addition, both adulterant groups showed only a very slight tint of blue to almost normal color levels. It was noteworthy that this discoloration process progressed more dramatically in the Stealth group than in the Urine Luck group. These results demonstrate that there is a built-in time limit for the detection of the adulterants Urine Luck and Stealth. Twenty-four hours after addition, these compounds appeared to have performed their adulteration functions and then faded away to almost undetectable levels. Such results underscore the importance of performing adulterant testing on site as soon as urine samples are collected. Delaying 24 to 48 h for testing runs the risk of not being able to detect them. Such observations were confirmed in a further study by Wong et al. (21).

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