i think u have better chance in getting ur answers by asking the force directly.
Dun think any forumers here have that indept information to share. even so, it may contravene the OSA.
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most of your questions are pertaining to police procedures and they are will not readily release such info.
its better to start off asking a moderately ranked police officer to get a "rough" picture.
then ask the police indepth of the Rough picture..
or post in the Police forum found in sgforums.