Answer: No DMT occurs naturally in your in body and smoking or ingesting only elevates it for the duration of your experience, since it is native to your body it is metabolized very quickly and can not be tested for.
Answer: Depends on what kind of test is being admin. UA(urine anaylasis) test will be clean in as little as 36 hrs for small dosages, up to 4 days if using high to toxic amounts. Blood test will be about the same. Hair follicle tests can go up to several months depending on usage and how long your hair is. This is for most all illegal drugs, however cannabinoids(weed, hash) are fat soluble and you can test positive for up to 23 days. (on UA test)
Answer: Yes, but it depends on the test. Cheap tests usually just say if there are any drugs that this country considers illegal at this time, Other more expensive tests will tell which type of opiate, lidocane, cocaine, novacaine, pot, THC content etc.., and to what degree of concentration in your urine.
Answer: It varies depending on how you take it but usually If you take cocaine occasionally, it will be present in your system for at least 72 hours Urine tests show the presence of cocaine within 1-3 days from the date of intake in case you take cocaine rarely or for the first time. If you take cocaine frequently, your urine test results will be positive for 10-12 weeks Your hair keeps cocaine up to 3 months from the date of intake
Answer: It depends on the test kit used, some will either say positive or negative while more complex versions will actually show positives for opiates(i.e. moriphine), opiate-types(i.e. tramadol), or opioides(i.e. Oxycontin or Methadone) individually.