Great work again. The juve/cadet idea is a very good one; I must remember that. Perhaps it's ride-along day at the precinct eh?
The heavy conversion is also nice. I have mine toting a Van Saar Heavy Stubber, but a Lascannon is just so over the top powerful, it fits the Arbites perfectly now I think about it. Obey, or incur the Emperor's punishment.
And all of a sudden I am reminded of the classic Dethklok song 'Laser Cannon Death Sentence'

Cops with lascannons, what could ever go wrong? 
Yup; there goes the neighbourhood...