Renting to a wife beater?

[Lam N.]

I was reviewing background checks and stuff of our tenants (we got 5 properties with tenants) and noticed something. A young mid 20s couple with a 4 year old. The husband was charged with domestic violence a year ago or so. 

I asked the property manager (aka my husband) about it and he said when he asked them about it the wife hugged the guy and said they were fine now. Apparently, they were the best candidates for the unit. 

I'm just wondering anyone with experience with renting to wife beaters? If it happens again, will it affect us?