Final answer:
When a prisoner's breath test reading is at 0.08, the board and watch commander need to be contacted. This level is considered the legal limit for intoxication in most US states.
Step-by-step explanation:
When a prisoner gives a breath test reading of 0.08, you should contact the board and watch commander. The legal limit for blood alcohol content (BAC) in almost all US states is 0.08%. In the context of law enforcement and corrections, it is important for officers to be aware of this threshold as it often denotes the legal definition of intoxication. Breathalyzer tests are commonly used to measure a person's BAC through a breath sample. The breathalyzer reaction involves the oxidation of ethanol by the dichromate ion, providing an estimate of alcohol concentration in the blood.