(if not, denied) Will your current landlord give you a good reference? 

They will also report it on credit so the rest of us will know to deny them. 

Even if they reported it, they can deny it, then blame the seller, then the seller blames them, then someone blames you, then you and your wife can't sleep at night because it's so stressful with all the finger pointing and potential lawyer junk fees to sort it out over a couple hundred dollars....Once the place is vacant go in and fix everything to your standards and start new.  

Landlords who don’t want tenants who are going to mug their neighbors or deal drugs will now be treated as racists and potentially sued.Last week, the Department of Housing and Urban Development issued new guidelines to landlords, warning that bans against renters with criminal convictions violate the Fair Housing Act because they disproportionately affect minorities.In effect, the Obama regime is now outlawing criminal background checks for apartment rentals, even though such screening is critical for the protection and security of tenants and property, and serves a legitimate business need.In a newly released 10-page missive, HUD warns landlords they can be held liable for discrimination if they deny housing over criminal records.

Similar if they're denying access as allowed under the lease.  

So it's not a nebulous amount.The reason I think this would be okay, is because you can legally deny someone based on their credit. 

However, if you don't accept Section 8 in any of your properties, you can deny her due to her S8 voucher, other than that, find SOMETHING wrong with her credit, or background check.

I would deny this applicant.Sure, anyone can lose their job, but this tenant is telling you up front that she won't have an income in a couple months.  

and that most can actually act 'normal' and deny it so much so that even their parents spouse or kids would swear they dont do anything 'but cigarettes' even when mj or harder drugs are indeed being used recreationally.i'd contact police to investigate (ie, what exactly is that white powder in my house?!) 

Sure, there may be some who have to fight with the credit bureaus to fix errors, but I doubt that a credit report that you would deny a tenant based on, would be that big a mystery.For instance, judgments for cell phone and cable bills, or one for a previous landlord.