I found out from the condo association office that the police has been out to the unit a few times on drug usage and charges have been filed.

Potential tenant with felony prescription medication conviction, not violent, wasn't incarcerated, sounds like previous landlord said he pays on time.

Having all of my application material online helps weed out the Luddites, drug dealers, conspiracy theorists, and other "cash only" type mentalities. 

I have a budget spreadsheet that I update each year based on previous year averages, and every year different issues pop up that cause me to spend my profits making the expenses instead.The first year I was the landlord at 22 and people didn't take me seriously, so I got taken advantage of by listening to every non paying tenant issue (flat tires, grandmas sick, have to water the dog, etc. ) The second year I had a property manager who was both stealing from me and renting to drug dealers.

I'd rather miss out on that $100 and not have to deal with the FBI over an alleged drug ring scandal, nor (which would likely be more common), haggle with the tenant over $5 that exceeded his $200 utility spending limit.You could say "$5 isn't worth arguing over", but understand that once you set expectations, you need to enforce them consistently or people in general will take advantage.It's really up to you though.

I remember reading Apartment Association newsletters about the problem, and they were advising landlords to never accept any tenant who had enough cash to pay up front, in case it was one of these bait and switch drug operations.I think there are other concerns, as far as taking the money could result in an "understanding" of a long-term lease, and it being harder to later evict, and possible tax problems, depending on the time of year the money is accepted.As I recall, I was reading about the meth lab bait and switch problem back around 2006 or 2007.  

People who have this addiction are more likely to gravitate toward other addictive substances too, like drugs and alcohol.

Also, your drug dealer tenants are likely trashing their place. 

Your SFHome or apartment isn't zoned for business,, if they have anyone coming to residence for that purpose,, hair cutting, tattoos, tax work,massage parlor, drugs, or daycare,,,,,, its gonna be a issue..  

Needless to say the arrangements were set and he was all scheduled to start the trial in Madison when the pharmaceutical company pulled the trial drug and we were left without treatment.. arrangements made were at our risk but worth the effort.