Techs look for excessive foaming when the sample is shaken (due to the use of adulterants, or Mountain Dew as a sub). A lack of foaming can be exhibited in some human samples regardless of gender.

Dont look for problems when there are none.
Burnt Toast Reviewed by Burnt Toast on . Substitution question Was curious about something. If one was to substitute urine, do the techs that collect your sample ever look for foam in the urine? It dawned on me that female urine doesn't seem to foam at all, and once male urine sits for a bit the foam disappears. Shouldn't this be a tell-tale sign of a sub? SWIM subbed in the past, but the tech was a younger chick, so her attention was easily diverted. Am I just trippin, or is this a legitimate concern? Rating: 5