Then you need to get written consent to perform a check and can ONLY consider the LAST THREE YEARS of criminal history.

Aside from providing the basics (ie. listing tool to get the property published to 10+ major sites, scheduling tool to schedule viewings, tenant screening with comprehensive applications -- pulled reports from TransUnion, which include nationwide criminal background checks + credit checks + eviction history, digital lease creation tool, rent collection tool, and maintenance tracking tool), some services also offer your tenants additional capabilities which makes it an easier sell on your end when getting them to transition over (ie. their ability to report on-time rent payments to the credit bureaus; this can create an added incentive for making sure they pay that rent on time). 

Squatters moving in or criminals breaking in to strip the house down of anything of value (electric, plumbing, and even appliances). 

In most cities, people with any kind of criminal record, even just an arrest, can be unfairly denied housing.

I'd also highly recommend screening the tenants credit, criminal, and eviction history.

I just want my house back while these criminals are living for free in it.

(Like Population, Criminal Activity, etc..)How, in general, would you go about making a list of markets (I'm looking at general cities in Canada)?

Not gonna risk potential criminal penalties for a tenant no matter how small the risk.

You can base part of your criteria on a FICO score if you want, but I like to be more specific.Minimum FICO score of 600No current credit delinquenciesNo past evictionsNo criminal convictions3x rentPositive rental referencesI like to list the criteria on the rental listing itself so you save yourself the time of eliminating those who don't qualify.  

If you do your tenant screening right verifying their credit, criminal, and eviction reports and checking with prior landlords, you should never be moving in tenants that do what they do to your friend.