Unless this action violates the terms of a collective bargaining agreement/employment contract or constitutes some form of legally actionable discrimination (which it does not appear to), then it is perfectly permisable. The fact is that in an "at will" employment relationship, a company can set the conditions of work much as it sees fit. This includes whehter or not to give an employee time off to check in with their probation officer. Further, if your huband takes the time off without permission, he can be terminated.