aiya, my cousin once got detained once for that, all it took was
for the parents to come up and talk for a abit and everything is
solved.
Not really detained, but held back for a really brief period of
time.
What you should worry about is whether they chop your passport
anot, wa laopeh and sister got detained through the night cos one
of the peeps at the toll gates forgot to chop the passport, then
they kinda questioned him on how he came through that checkpoint,
old tale. 
