No, I don't have any personal and professional experience with the police at all. I find it odd how there seems to be a different senior detective speaking at every press conference. If you pay interest to the news, you'll know this is highly unusual. Usually you see the same detective/chief leading throughout a high profile case. It gives continuity to the campaign and reassurance to the family and community.
Maybe there are innocent reasons for it (holidays, days off etc), but as this is a sleuthing site I'm, erm, sleuthing.