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.)

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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