Upon reading the article about TaskRabbit, I think Airbnb can apply the same type of checks:
"Since many common tasks are carried out in the senders’ homes, runners are vetted through a three-step process..
which starts with an application form and progresses to an automated phone or video interview that poses a series of questions designed to weed out deadbeats.
Finally, TaskRabbit pays the database giant Acxiom to perform a federal criminal background check on each prospective worker."