How can I conduct a tenant screening for a person that is moving here from Canada?

[Sheila Kennedy]

Are there any good screening companies that screen Canadians?  The wife does not work so the financial responsibility would fall to the husband.  They omitted listing her on the application. I would still want to screen both of them though, so I am thinking of telling them they must complete the co-applicant section anyway.   I understand that anyone over the age of 18 should be listed on the lease regardless.  All feedback would be appreciated :)