Trait controlled by the both environment and genetic factor. Usually, multifactorial traits outside of illness result in what we see as continuous characteristics in organisms, especially human organisms such as: height, skin color, and body mass.
I recently took a drug test for a job. I tested positive for opiates in my urine. I do not and have never taken drugs of any sort other than alcohol. I dont take any prescription drugs, how is it possible that this happened. I hade consumed some beer about12 hours before the test.
Opiates will stay in urine for 1-7 days, depending on your size and the amount/frequency of use. However, they will remain at detectable levels in your blood for up to 20 days, again, depending on the volume, frequency, and your size. 29 people found this useful.