Even in the tabloid Daily Fail’s sensationalist article on it, they detail the kind of exposure you need to test positive... unless your mom has shut you up in a tiny unventilated room with her while she chainsmokes one joint after another of the most potent cannabis she can find, and you are tested immediately aftewards, you should be ok
Six smokers and six non-smokers spent an hour sitting side by side in a 10-by-13-foot, acrylic-walled room in two different experimental sessions.
Each smoker was given 10 high-potency cannabis cigarettes to smoke. In one session, the room's ventilation fans were turned on.
In another session, the fans were turned off, and the room became smoke-filled
At the end of the exposures, smokers' and non-smokers' blood, urine, saliva and hair were tested at regular intervals for THC.
All six non-smokers who spent an hour exposed to second-hand smoke in the unventilated room under extreme conditions had detectable amounts of THC in their urine and blood.
Four hours after the experiment ended, one non-smoker tested positive for THC on a urine test.
At intervals between two and 22 hours after the experiment, four of the six non-smokers tested positive for THC in their urine at a lower cut-off sometimes used in commercial drug testing programs.
None of the non-smokers exposed to second-hand smoke in the ventilated room tested positive for THC.
Non-smokers exposed to second-hand smoke with fans running reported no effects other than being hungry.
I guess it's possible to be exposed to enough second hand smoke to have it detected in some tests, but these would really be the extreme cases...not typical exposure to an individual who uses it.
Just be honest and you should be fine.
