This is what i have found out.Opiates are a class of drugs made up of the following : morphine, codiene and monoacetylmorphine (heroin metabolite).The doctor was wrong in telling me that it could only be heroin.Its unlikely to be heroin if there are no traces of morphine in the blood.Has to be the headache pills with codiene im thinking.They have 8mg of codiene per pill maybe i took 2 or 4 around the time i went for the test because it was around then i think i had a headache last.Could that do it or not enough mgs to show up ? Im thinking i should go smack the bitch in the mouth for saying that to me about heroin.Shes a doctor and should know better than to stereotype me because of how i look with tattoos and piercings or one time i had drugs and it fucked me up.I learned my lesson from that and as the test shows none of those drugs are in me.She looks at me sees i have bipolar and Every doctor assumes its because of drugs other than weed.Thats the thing the FUCKING IDIOTS think im on speed and i show up for opiates it just goes to show how clever some doctors and psychiatrists are.
Yes.
Heroin breaks down into codeine and morphine in your body.
A Percentage of codeine you consume is converted to morphine in your body.
The test probably looks for codeine, morphine and other metabolites in your urine.
The presence of codeine can be the result of either heroin or codeine use. The presence of morphine can be the result of the use of heroin, codeine, or morphine. Relative levels of codeine and morphine can help determine their origin.
Erowid: http://www.erowid.org/chemicals/opia..._testing.shtml
They should do a retest.

It also gets me when people talk about lacing weed, im not saying it is impossible but improbable for a drug dealer to take heroin and effectively 'lace' it with the buds.
Heroin costs money (in some areas along the east coast it can get pretty cheap) and there really isn't a logical reason to do so. You would definately know if you 'smoked' heroin, it provides a rush of euphoria comparable to IV injection and it should at the very least occur to you that you smoked some damn good weed.
Some people have claimed dealers would lace weed to get you addicted to it, the flaw in this is that it takes several weeks of consecutive opiate used and sudden cessation to notice any withdrawals and by the time you've gotten addicted to it the dealer has provided you with a good amount of heroin along with the cost of your bud, and nothing assures you're going to run and start buying heroin off them. Most likely you would be pissed and not buy a damn thing from them ever again.