You can just go to the police station they can take care of it. Direct u the right way. If your not a constant user of marijuana it shouldn't stay in your system long. But it sounds like it was laced. Though it's been so long since I've smoked I have no clue what it's like nowadays. Beyondtherainbow is right. So many bad things can happen. At very least I would get a few thc test kits from store so you know when it's out of your system. My grandmother was given a few hits off a synthetic pipe and ended up in a coma. She never fully recovered and ended up passing away. Because she knew what it was and was convinced it was safe no files were charged.

No matter how small, a positive change deserves to be celebrated!