What psychophysical indicators suggest someone is under the influence of narcotic analgesics?

The correct answer highlights that poor coordination and balance are key psychophysical indicators pointing to the influence of narcotic analgesics. These substances can significantly impair motor functions, leading to decreased muscle control and coordination. This impairment can manifest in difficulties with walking, standing, and performing coordinated tasks, making it evident that a person may be under the influence of narcotics.

In contrast, increased energy levels, enhanced reflexes, and heightened sensory perception are not typically associated with narcotic analgesic use. Instead, narcotics usually sedate users, which results in lethargy rather than energy, dulls reflex responses, and does not enhance sensory perception. Understanding these effects is crucial for recognizing the signs of drug influence in various contexts, especially in law enforcement and public safety.