Prior to the development of crash test dummies, automobile companies tested using human cadavers, animals and live volunteers. Cadavers have been used to modify different parts of a car such as the seatbelt This type of testing may provide more realistic test results than using a dummy but it raises ethical dilemmas because human cadavers and animals are not able to consent to research studies. Animal testing is not prevalent today. Computational models of the human body are increasingly being used in the industry and research to complement the use of dummies as virtual tools.