You can pass a urine drug test is you've used illegal drugs or prescription medication that was not prescribed to you. There are many methods that can eliminate or mask drug metabolites in your system to give a negative urine drug test. Some individuals opt for what are know as "home remedies". Examples would be drinking a lot of water prior to testing, as an attempt to dilute urine. Others will try urine spiking, by adding bleach, salt, or vinegar to their urine samples when in the bathroom of a testing lab. None of these methods are recommended, as the labs have adulteration tests that can pick this up, no matter what you may read on certain drug testing message blogs or forums.
Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
In Florida (Manatee County), there was a recent seizure of carfentanil and a coincidental increase in overdoses and deaths. While more than a dozen fentanyl analogs are commonly flagged in postmortem testing in many states, it is difficult to assess how commonly carfentanil is being abused because states have few reference materials on this drug and few labs are equipped to test for it. The forensic toxicology laboratory researchers at the University of Florida are currently developing a new assay for the identification of carfentanil and will soon start including it in postmortem overdose death testing. Laboratory personnel are being warned about the potency of the drug and are advised to handle it with great care. Naloxone (Narcan®) should be available in the case of accidental exposure.