Which of the following is NOT an indicator of MDMA and ecstasy use?

The presence of needle marks on the body is not an indicator of MDMA or ecstasy use because these substances are typically taken in pill form, which does not involve injection. Users of MDMA or ecstasy typically experience a range of effects that can manifest in various physical and behavioral signs, but intravenous use is not common with these drugs. Therefore, the absence of needle marks is consistent with the typical patterns of consumption associated with MDMA and ecstasy.

In contrast, teeth grinding is a common effect as MDMA can increase muscle tension. Seizures can occur due to the drug's impact on the central nervous system, particularly at high doses or in combination with other substances, and aggressive sexual behavior can also be associated with the increased stimulation and altered perceptions caused by the drug. These effects highlight specific behavioral and physical symptoms tied directly to the use of MDMA and ecstasy.