![]() ![]() Although the pupillograph can measure the pupil size and reaction time, that doesn't mean it can tell without a doubt whether illegal substances have been consumed, let alone which ones. Yet a normal reacting pupil doesn't automatically mean the subsequent blood test will come back negative. They may also lead to an enhanced sensitivity to glare." "These symptoms can outlast the subjective effect of the substance for many hours and up to two days. "Cocaine, amphetamine and THC, as well as a limited number of hallucinogens, lead to the pupils' delayed or lack of reaction to light,' he said. The toxicologist Thorsten Binschenck-Domaß went into more detail about the effectiveness of these kinds of light-driven reaction tests. ![]() But according to Holger Vehren from the Hamburg police's press office, the measuring device isn't "the wonder weapon of drug detection, it's more of a 'pre-test' before a blood test." Why else would the Hamburg police be running tests on people's pupils? They use a pupillograph, a device that looks like how people in the 60s would have imagined super-futuristic 3D glasses, and it's supposed to be able to tell if a driver is under the influence of drugs or alcohol. When there’s a lot of bright light, your pupils will become smaller. This allows more light into the eyes, making it easier to see. However, the eyes still seem to offer clear clues to a person's sobriety or lack thereof. Pupils tend to become bigger (dilate) in low-light situations. Dizziness, Small (constricted) pupils: Jerking eye movements, Small (constricted) pupils: Sensitive to light, Small (constricted) pupils: Floating spots or strings in vision, Small (constricted) pupils: Small (constricted) pupils, Unequal pupils (size) Bulging eyes, Lump or bulge, Small (constricted) pupils, Sunken eyes: Pain or discomfort, Red. ![]()
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