Even if he has no credit/criminal history in this country, you should process an application screening like you do for every applicant.

Seller to cover attorney fees for prosecution of eviction. 

Run a full background check to see their credit score, prior evictions and criminal record.

@Albert Bui  I have done quite a few sub too's and I have had a few called. even though they were current... we of course just cut checks to pay them off.Where sub too becomes a disaster is when the person buying it then sells on contract to a sub prime buyer who then goes on to default.. and the person who did the sub too sandwhich does not have the means to make payments during the foreclosure process and or has the money to prosecute the foreclosure..

On the flip side given how sub to has been mass marketed through the guru / trainer folks you are going to have a lot of the buyers who are NOT properly capitalized  who dont understand how to do these correctly or are just plain crooks and when things dont work out they walk or even worse realize they can just rip rents and not pay on the mortgage this was very common back in the mid 2000s  I got a few interviews with the FBI chasing down folks that did this 20 30 50 times they were criminal enterprises and they ended up in prison..

Sub2 is for criminals and deviants.

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

I'm not saying to invest in El Salvador (I haven't researched it enough) but I think property rights need to be protected in two ways; from arbitrary government abuse, but also from rampant criminality. 

Although you can't look up criminal history, you can get landlord references from other landlords with whom they have worked.

Unless you ran a full credit, criminal, and eviction check using the tenants SSN and drivers license (which you must have their permission to do) you can't be sure that the records you are viewing are in fact one and the same person who was your tenant.