Blood Alcohol Content is the legal name for BAC but Blood Alcohol Concentration is sometimes used for simpler description. Blood alcohol content is usually expressed as a percentage of ethanol in the blood in units of mass of alcohol per volume of blood or mass of alcohol per mass of blood, depending on the country.
One way that society controls science is that the government can make certain experiments illegal. Hmm, maybe, but the apex answer is: People pass laws to restrict some research.
Most dystopian works present a world in which oppressive societal control and the illusion of a perfect society are maintained through one or more of the following types of controls:  Corporate control: One or more large corporations control society through products, advertising, and/or the media.