This is calling a It's called a 481a adjustment, and should be pretty easy to detect on your depreciation schedule.

I feel like a detective at this point....hmmm 

Or spend a little more, and get one that can detect water leaking, and stops the flow when the handle sticks.

However, the best example is that airlines no longer are allowed to ask for proof that a service animal is required.Plus, because the use of service animals have extended so far beyond the previous scope of assistance animals, it becomes a quagmire as you get into situations where diabetics use dogs that can detect an oncoming blood sugar crisis before a blood test; people with seizure disorders have dogs who can detect an oncoming seizure, which medical science can't outside of an MRI/CAT/EMG; and therapy animals used to calm people with emotional &/or psychological disorders.  

There are bed bug detection services that use a trainer and a dog to sniff for the presence of bed bugs.  

.,. then Baltimore gas and electric showed up and said their gas leak detector detected small amount of gas leaking.. it was coming from a cracked head on the furnace.. so it was old and need of replacement.. so we decided to replace it completely  however I need to mention I have brought my mother in law on board to do the book keeping duties and she is on site 2 days a week to let the exterminator in and do paperwork.. she was bombarded by this tenant who was threatening to call the police due to no ac and without consulting me she hired someone who was willing to install a unit in 2 days time instead of a week and instead of spending $3,500 for a new unit she spend $7,000.. this is a huge problem for me as I have a policy of no work or repairs done over $500 without my consent.. so he got a new $7,000 unit.. and I have taken the checkbook from my mother in law..

Since it is just a door, I wouldn't do too much detective work on finding the perp.

Then take the next step: engage the proper authority, ask tenant to explain, look the other way and have it come back 10 fold should the detectives want  to "ask you a few questions" upon his inevitable arrest. 

Playing the detective role of trying to see if previous landlords listed on the applications are legitimate and not applicant's friends.3.

Since when did being a landlord turn into being a detective, thats my joke of the day.