if you handle enough thc it will soak through your skin just like any other drug will it does with amphetamines and cocaine, heroin and obviously lsd
but in order to test positive you would have to have handled a fuckin lot of weed if the handlin the weed was to get u stoned then yea it would test positive
i dont really think youve got anything to worry about
and anyway they can usually tell if you have actuallly smoked it or you have inhaled thru passive samoking which i suppose if it were to show that the amount of thc present would be too low for them to say u were tokin on it
if ya get me on this

also thc isnt very soluble it will only really dissolve in alcohol so that makes it even harder to soak through your skin