Buying duplex with Section 8 tenants? Am i "stuck" with them?

[Domin Car]

Hi , I am considering buying a duplex with section 8 tenants,  I none of my other properties are section 8 and I don't want to have more inspections that I already have from the city . 

one tenant is month to month one has couple months until their lease is over , can I stop offering section 8 after their lease is up or because the property is approved I have to keep offering it?