implied consent

That manifested by signs, actions, or facts, or by inaction or silence, which raise a presumption or inference that the consent has been given. An inference arising from a course of conduct or relationship between the parties, in which there is mutual acquiescence or a lack of objection under circumstances signifying assent. Allstate Ins. Co. v. State Farm Mutual Automobile Ins. Co., 260 S.C. 350, 195 S.E.2d 711, 713 (use of motor vehicle).

For example, when a corporation does business in a state it impliedly consents to be subject to the jurisdiction of that state's courts in the event of tortious conduct, even though it is not incorporated in that state. Most every state has a statute implying the consent of one who drives upon its highways to submit to some type of scientific test or tests measuring the alcoholic content of the driver's blood. In addition to implying consent, these statutes usually provide that if the result of the test shows that the alcohol content exceeds a specified percentage, then a rebuttable presumption of intoxication arises

See also express consent