The document introduces the VIPRE S-5000 voice stress analyzer, which measures physiological stress levels in the voice. It notes that VIPRE technology is used by law enforcement and military worldwide to determine truthfulness and focus investigations. The document explains that VIPRE analyzes stress patterns in the voice transmitted via the vagus nerve, and uses a color-coded system to indicate stress. It states that VIPRE testing follows established protocols and is not a "lie detector" but rather a tool for measuring stress during investigative questioning.