Many states have laws referred to as “implied consent laws,” which provide that a person operating a motor vehicle on a public highway is deemed to have given consent to a blood, breath, urine, or saliva chemical test for purposes of determining alcoholic content of blood whenever that person is involved in a traffic offense and the responding officer has reasonable grounds to believe that the person was driving under the influence of an intoxicating liquor. Regulations on breath testing address both the manner in which the breath is collected and the manner in which it is tested. These regulations also address the laboratories themselves, as these laboratories and their personnel must typically be certified to perform breath alcohol testing.