Say a person (not me, heh) wanted an Immigrant Visa. But had recently been given a 2 month suspended sentence for 12 months, with 150 hours community service for Attempting/Intending to Pervert the course of Justice.. are they completely screwed or not?

I have no idea, and neither do they, about what sort of record would stop them from getting an Immigrant Visa, so any sorts of examples would be appreciated