Lex loci actus is the law of the place where a legal action takes place. It is the place where the act occurred that gave rise to the legal claim. Generally the form of a contract is governed by lex loci actus. A compliance with the lex loci actus is all that is required to give validity to the will in a state.
In Austin v. River, 95 Ohio App. 400 (Ohio Ct. App. 1953), Whether a plaintiff has title to a vehicle must be determined by the substantive law of his/her state of domicile, and depends on whether plaintiff has complied with the law of the state of his domicile in respect to registration of motor vehicles, lex loci actus, the rule of the place of the act must be proved.