As a neighbor, personally I don't care if someone smoke a little weed every now and then, but if they are smoking non stop 25 times a day, you might lose a good tenant over that. 

I learned a lot hearing David and Rob go into the weeds. 

Check "flexible" dates for a house with a pool to weed out the condos with shared pools.

It is growing like a weed and there plenty of growth left to be had. 

Now, don't get me wrong...I hear exactly what you are saying but then again isn't that really just to weed those that just want another course to sit on their shelf and point to and say...that doesn't work?

They made an error or are just confused, it weeds most of them out.

Criminal background will weed out some bad actors as well.  

I find that usually weeds out any problem guests. 

The tenants are not pulling/spraying weeds around their building, so it takes me about 30 minutes every month to pull weeds and spray.

Given that I am self employed, a few personal loan options, did preliminary asking about my situation, and they got lost in the weeds with how my real estate income looks so dismal on tax returns.