My PM might not testify for me in court, since he knows he has to pay for my rent loss and legal fees.  

Anthony Fauci testifying just two days ago that it's 10 times more lethal than the flu?

You have to go to court prepared, bring in your contractor to testify, have them bring in their estimates, invoices, log books, employee time cards, material lists, receipts, etc.

If you are going to carry a gun: 1) make sure you're doing it legally (i.e. have a carry permit), 2) bring a friend or associate with you, so if you have to use it you have a witness to testify that it was justified. 

Can you get the ex-tenant to testify if needed that he sometimes used that area?

I love getting people hiding behind an LLC Testifying in a deposition under oath, and they start out lying and I let them trap themselves and they never know I have all the facts.

Unless one of us can testify under oath that we saw them smoking it on the property, there really is nothing they can do at this point in time as far as taking them to court to evict them.

My lawyer subpoenaed a police officer from the drugs squad to testify and we had quite the Law and Order episode.

We took them to small claims court with 3 subpoenaed witnesses (friend, neighbor, house cleaner) all ready to testify on our behalf that we left the house per the contract.

If the plumber can testify the blockage was from feminine napkins your tenant should pay his costs.