"clients" eh? sounds "interesting" heheh!
as for the jpj roadblocks, altho' i've never tried it out b4, but sometimes i feel that if you think you're right, and hv the time to do so, you need to bug & argue with them so as not to be bullied. they know most of us don't want to waste time with them and would just settle for a saman to go off quickly, and they probably also hv a saman quota to meet every week/month...
especially with the polis, if u argue with them and waste their time, they'd probably shoo u off as you're wasting their time for getting some duit kopi from other motorists!