I heard that some landlords are now asking prospective tenants for a credit bureau and police reference report.
Asking their previous landlord doesn't work because he/she will say anything to be rid of them.
Even this does not weed out all of the unsavoury sorts. I did such due diligence in the past on a tenant and despite that, and good references, he turned out to be an ongoing nightmare for me.
While there are many rights given to tenants in Ontario, there are also many rights given to Landlords. Ultimately, the landlord has more rights, because they are the property owner.
There are many legit ways within the Landlord Tenant Act which allow a tenancy agreement to be terminated. Most require 60 days notice. They cover breach of contract, disturbing the natural enjoyment of surrounding living space for others, failure to pay rent, disruptive and destructive behaviour, reclaiming property for personal use, to name but a few.
But in every instance, you must follow the rules of the Act to the letter. Document, document, document. And keep copies of all letters and documents you give to your tenant. Ideally if you send it via registered mail so there's a recorded paper trail. That way if it goes to court, you have documented evidence of following the Act. Unless its an extreme circumstance, eviction is a 2 month process from the moment you deliver a termination of lease notice.
Good luck!