Strange Smell in House - Smells like Weed but not sure...

[Chuck Dangar]

I am looking at buying a place to rent out that has a strange smell.  I have not been in the house but the person who went in said it smelled like weed.  There is new carpet in the house but now I'm worried about it being an old meth house.  I've heard that that smell is more like cat urine and/or rotten eggs.  If I'm buying a foreclosed home that is AS-IS, does there have to be a disclosure that it was previously a meth home?