How long for morphine sulfate to be detected in urine?

I hear it takes about three days- its usually about 2,3,4 days for any kinda of drug other than weed....

The 3 days is correct.The incorrect part of this is that not just weed will stay in your system for any period of time.Any type of drug that is smoked/inhaled will stay in the cells of your lungs and the fatty tissues of your body.People smoke cocaine,speed/meth,heroin,raw opium etc..even some medications such as the old qualudes and mandrexexes people smoked called "chasing the dragon".Any drug smoked can stay in your system 30 to 60 days depending on the amount of fatty tissue in your body.