We don't see it as an incentive to go to work sick, because screening officers, without this incentive, are entitled to all of their base compensation, which includes their hourly wage, their health and dental benefits, paid sick leave, paid holidays. This is supernumerary to that compensation, so they're not out-of-pocket in any capacity.
The incentive program is an additional bonus structure that they can avail themselves of when it's the best opportunity for them.