So far i do not see LTA putting warning against this. but
possession of it is against IDA rules.
Anyway, such technologies existed for quite some time in US. but
not all are 100% effective.
because, there are different laser frequencies, so you might be
using the wrong one to jam which results in ineffectiveness.
In US, you use such things, you mess up police's laser gun, police
got no evidence against you speeding and thus you are "scot free".
(though some states have laws against possesion of such
equipment)
In singapore, you use such things, you mess up their laser gun...
you think you get away scot free?