Being a nurse, I am certain they have already obtained a urine specimen from the son in custody, and they may have had a blood draw done also. With the rampant drug use nowadays, it's practically routine. Somebody mentioned possible steroid use. That problem is also growing. Even steroids given for short term therapy can really reek havoc with your emotions. They can make you happy and relaxed, because they are taking away pain and inflammation, or they can make you nervous, snappy, jumpy, tired, mad, or tearful. Depends on the dose and your individual chemical makeup.
Probably alot of people, especially the younger ones also don't know they can permanently scar your stomach lining, some to the point of causing long term digestive problems and make your bones brittle. They are necessary in certain cases, but they have alot of undesirable side effects.