What is a “barely detectable” level of meth? Is it in the neighbourhood of “residual of a normal dose in the last 3 days” or in the range of “within 3 to 4 months ago”?
Assuming a person takes meth regularly. (I’m sure it happens). Then, their bloodstream and excretions will contain detectable levels. However, urine contains decent levels because that is the major path by which the body rids itself of unnecessary chemicals. Something like seminal fluid, one presumes (IANAD) does not get created by attempting to concentrate and remove blood contaminants. (If anything, the opposite). So the concentration would be so low that at best it should match the blood levels. Just because it’s in the neighbourhood of the bladder does not make it a backup reservoir for the same function…
So a full pill is taken, which then dilutes throughot the body to what, 1/10,000 or more of original amount. Body mass and fluids probably amount to 100+ pounds, and the original pill was a small fraction of an ounce That’s pretty dilute. It also immediately starts to be excreted, so concetrations in the general blood stream on average are pretty low.
So she swallows maybe a CC or so of minimally contaminated fluid at low concentration.
Several points come to mind:
“Gee, mom, maybe you should spit instead… Duh.”
“Do you always blow him right after he took a hit?” (Actually, that should not matter - worse would be blowing him just before, so that his “reservoir” refills while his blood is at maximal concentration of the drug)
“How many times a day do you blow him?”
See, good parental chit-chat can be prouctive.
My BS meter kicks in, because unless the test is capable of detecting incredibly fine concentrations, 1CC or so of very dilute drug mix once or twice a day should not give detectable levels. I gues it would be like taking a tiny fraction of a salt-grain-sized chip of a normal pill. I would suggest she’s more at risk from backwash if the guy chewed a pill or three then took a sip and backwashed into her beer.
Finally - who said she tested positive? Why the test? Sounds like she’s on some sort of court-ordered testing program to stay clean or else. If so, then however she spins it - why would you be anywhere near a person who could derail your tests if it is that important? Why would you hang around that temptation?