tweaker

A tweaker can appear normal -- eyes clear, speech concise, and movements brisk; however, a closer look will reveal that the person's eyes are moving ten times faster than normal, the voice has a slight quiver, and movements are quick and jerky.¹⁴ These physical signs are more difficult to identify if the tweaker has been using a depressant such as alcohol; however, if the tweaker has been using a depressant, his or her negative feelings - including paranoia and frustration -- can increase substantially. A person should use extreme caution when dealing with an individual on methamphetamine.