What are other ways to detect meth use besides formication (speed bumps), rapid speech, positive drug tests and decaying teeth?

You got it all: You seem to have nailed it, in addition dark circles under eyes, tired face and body but inability to sleep. Severe mood storms, anger and aggression, auditory but more often visual hallucinations are seen. Weight loss due to loss of appetite will be prominent.

Rapid attrition: Many manifestations occur, but it is most commonly seen as a rapid attrition or shortening of the teeth, especially the lower front teeth.