What type of test is designed to measure blood alcohol content or drug levels in a suspect?

The correct response is grounded in the fundamental purpose of chemical tests in the context of DWI (driving while intoxicated) arrests. A chemical test is specifically designed to quantitatively measure the amount of alcohol or drugs present in an individual's system. This type of test typically includes blood tests, breath tests, and urine tests, which are scientifically validated methods to determine a suspect’s blood alcohol concentration (BAC) or the presence of drugs.

Field sobriety tests, in contrast, are observational tasks intended to help law enforcement officers assess a person's impairment rather than measure specific blood alcohol content or drug levels. These tests evaluate the suspect's ability to perform physical tasks and follow verbal instructions, largely based on coordination and balance.

Roadside evaluations can refer to a combination of field sobriety tests and preliminary breath tests performed at the scene, which serve as preliminary assessments rather than definitive measures of blood alcohol or drug levels.

Breath analysis is a form of chemical testing that specifically uses a device to estimate BAC through the air exhaled from the lungs but does not encompass all forms of chemical tests, such as blood or urine tests. Therefore, while breath analysis is a subset of chemical tests, stating that chemical tests encompass all methods used to measure a suspect's BAC or