Tiny Bags with Crystalline Substance in Washer, now Dryer too

[Neil G.]

months ago i had found a tiny zip locked bag with a few crystals in it the washer and didnt think much of it til i came back from vacay/business abroad to be told by neighbors left and right that my tenants in the rental unit of my duplex have turned the place into a 'meth house' (right) and that people are up all night vomitting loudly on a nightly basis (left) and now noticed the same thing again in the dryer this time, a tiny zip lock baggy with just a couple grains of what looks like large sugar crystals.. 

what should i do with it? the only ones with access to washer/dryer besides me (i live with only my cat who travels with me most the time) are the tenants (a family of 4, all adults no kids) who are default for which there is a separate thread about vacating for default and breach but now this takes it to a whole other level, possible narcotic on my clothes what if some of it seeped into my clothes etc is that possible? also, not likely, but.. what if they are making it (meth?) IN the house?! arg