If my room mate grow more than 4 pot plants will just he get in trubble or will every living there?

My room mate was talking about grow more than 4 pot plants and I told he he could get into trouble for it but he didnt really seem to care so I was wondering if he does and he gets caught will just he get charge for posession of more than 4 plants would everyone that lives in the house get in trubble and if so what... show more My room mate was talking about grow more than 4 pot plants and I told he he could get into trouble for it but he didnt really seem to care so I was wondering if he does and he gets caught will just he get charge for posession of more than 4 plants would everyone that lives in the house get in trubble and if so what should I do if he decides to grow more than 4?
Update: I live in Oregon
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