That's crazy. Failing a drug test is probably not legal cause to evict you, and refusing to take the test almost certainly is not. Of course they can do a no-cause eviction if you don't have a lease.
Landlords can and do put all kinds of unenforceable clauses in leases, though. There's no incentive not to because some people will see that they've violated an unenforceable clause and simply move out assuming that it is legal.
I'm now fairly sure the wild cat I saw recently was a bobcat. There was some recent light snow and when I ran in that area again I saw what I'm fairly certain are bobcat tracks. 4 toed with a indent on the main pad at the top-center, no claws, about 2.5 inches long.
I also found someone saying that bobcats can have brown fur in fall to early winter and I found this video of bobcats playing with one having the same color fur I saw and a longer tail with different colored bit at the end of the tail.
One of the details that made me think it wasn't a bobcat was that the tail was not just a little stub like most of the images I found online. Also, I didn't notice spots. But mostly seeing it from the back, if it's coat was similar to the cat in the video, I wouldn't have immediately noticed spots.