Can marijuana get in your system from secondhand smoke?

Yes, but: Usually the amount would not be very high unless you were in a closed off space with significant amount of smoke for a lengthy period. I would not hang around people smoking marijuana to avoid their second hand smoke.

Marijuana: Yes it can get nto your system.

Yes: Yes, of course, if you breathe in second-hand marijuana smoke some will get into your body. It is seldom enough to have you feel the effects and even less common to be enough to cause you to test positive on a drug test, though if you were in a small space like a car with someone who smoked a lot you might test positive for a short time afterwards!