What methods are used by police to detect and measure drugs in the body?

The methods used by police to detect and measure drugs in the body are comprehensive, focusing on both physiological testing and expert evaluations. A blood test is a direct and reliable way to measure the presence of drugs in a person's system, as it provides a quantitative analysis of substances. Additionally, drug recognition experts are specially trained law enforcement personnel who utilize a series of standardized tests to assess a person's level of impairment and identify potential drug use based on observable behavior and physical signs.

The combination of these two methods ensures a thorough and reliable assessment of drug influence. While a blood test offers concrete evidence regarding drug concentrations, the expertise of a drug recognition expert brings in qualitative observations that can indicate impairment even before lab results are available. This multi-faceted approach enables law enforcement to effectively address drug-related offenses and ensure road safety.