Although the majority of drug testing is performed using urine specimens, more recently drug testing in alternative specimens such as hair, oral fluid, and sweat are gaining popularity. One advantage of performing drug testing using these alternative specimens is that it is extremely difficult for the donor to adulterate such specimens, as occurs with urine drug testing when the urine collection process is not supervised. Nevertheless, there are commercially available shampoos and hair cleaners that claim to wash out drugs from hair follicles. In addition, mouthwashes are available to pass drug testing using oral fluid specimens. Unlike various urinary adulterants, which are effective in masking several drug testing methods, most of these products marketed for cheating drug tests involving hair, oral fluid, and sweat are ineffective.