Substituting a friends urine 20 min. before the test, have the temperature and disposale problems figured out.

Only question, can they identify between urines? I have sent my own clean urine in before, but recently smoked again so using a friends. Just want to make sure, i'd rather test dirty than get caught for substitution.
biggytokes Reviewed by biggytokes on . Substitution Quick Question Substituting a friends urine 20 min. before the test, have the temperature and disposale problems figured out. Only question, can they identify between urines? I have sent my own clean urine in before, but recently smoked again so using a friends. Just want to make sure, i'd rather test dirty than get caught for substitution. Rating: 5