poppy seeds won't make nasi kandar sedap

ganja, on the other hand, will

just a sprinkle of a few crunched up leaves, oboi oboi, tetap wangi dan sedap, and tetap mau makan2 lagi2

You will get a false positive after heavy consmption of poppy seed, I don't simply tembak it has been proven.

Read again, poppy seed contain the same morphine and codeine as opium. With high enough consumption, you can actually get high on poppy seed as well. Urine test is done to specifically test for those substance in your urine no matter the source and therefore will give a postive, it is the follow up test that will prove negative, that is if the local police care enough to send the urine for further test instead of press charges based on the early result obtained from urine test.

Reading this give me a new meaning to "Nasik Ganja" (those from Perlis knows it).