&gt; I can understand how repeated interaction with a recalcitrant criminal element could harden and corrupt a police officer.<p>If a job is hard and hardening, <i>and</i> the job requires you to behave fairly, sensibly, and rationally, then a reasonable employer will <i>often</i> and <i>regularly</i> check to ensure that the job hasn&#x27;t damaged the employee in such a way as to render them useless or ineffective.<p>One common way to handle this sort of thing is to proactively rotate employees in and out of the stressful portions of the job.