October 27, 2015

DWI Detection and Standardized Field Sobriety Testing Pupil size will be affected by several categories of drugs, and also by some medical conditions or injuries.

Session Overview – Introduction to Drugged Driving
DWI Detection and Standardized Field Sobriety Testing
Pupil size will be affected by several
categories of drugs, and also by some
medical conditions or injuries.
Drugs causing pupil dilation:
CNS stimulants
Hallucinogens
Cannabis
Pupil Size
1-13
Pupil Size
Pupil Size will be affected by several categories of drugs, and also by some medical
conditions or injuries:
• If the two pupils are distinctly different in size, it is possible that the subject has a
glass eye, or is suffering from a head injury or a neurological disorder.
If the pupils are noticeably dilated, then the possibility exists that the subject could be
impaired by certain categories of drugs:
• CNS stimulants
• Hallucinogens
• Cannabis
Session Overview – Introduction to Drugged Driving
DWI Detection and Standardized Field Sobriety Testing
If the pupils are noticeably constricted then
the possibility exists that the subject could
be impaired by a narcotic analgesic
Pupil Size (Cont.)
1-14
Pupil Size (Cont.)
If the pupils are noticebly constricted then the possiblity exists that the subject could be
impaired by a narcotic analgesic.
CNS Depressants, Dissociative Anesthetics, and Inhalants usually do not affect pupil
size.
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HS 178 R5/13 9 of 29Source: DWI Detection and
Standardized Field
Sobriety Testing
March 2013 Edition

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