Who may legally require you to give a blood sample?

The police have the legal authority to require you to give a blood sample, particularly in situations related to driving under the influence of alcohol or drugs. This is part of law enforcement's responsibility to ensure road safety and to enforce laws regarding impaired driving. If you are stopped by the police and they suspect that you may be driving while impaired, they can request a blood sample to determine your blood alcohol concentration or the presence of illegal substances.

Medical professionals, such as your doctor, typically require blood samples for health assessments or treatments but do not have the authority to compel you in the same way police do. Similarly, an employer or a family member lacks the legal power to enforce taking a blood sample against your will unless specific legal conditions are met, such as in workplace safety scenarios which are governed by different rules and regulations.