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.