yeah, It would be nice, the time should increase after we arrest the second criminal. +1
Going with that, ^
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You could just use this: http://wiki.multitheftauto.com/wiki/GetDistanceBetweenPoints2D (which I believe is what is used to determine the closest hospital when you die). Get the distance between you and the closest PD then base your time on that.
I don't have any problem with bringing prisoners to jail