In fact there are quite a few police pilots who had IRs when they "joined". The employers cared so little about this iissue that they have not even kept the pilots with existing IRs current (in general).
From conversations I have had, I know that a number of them have lost their IRs now, so that they would have to re-do them (not just do a renewal retest). It almost feels like deliberate de-skilling to make those pilots less employable outside police aviation.