"A second situation in which one's bodily integrity is violated is where the other party has a strategic reason to obtain something of interest from the body of the person. The principal example of this is where a body sample is sought from a person. As a general rule more information about a person can be ascertained from bodily samples than the forms of bodily “invasions” referred to above. An enormous amount f information can potentially be obtained from a hair, saliva, skin, urine, breath or blood sample. This the right of information privacy is potentially more strongly invoked in these circumstances. In some cases the right to physical integrity also comes into play. This applies to all of the above examples, except breath and urine samples. All of these procedures are permissible with the consent of the person involved. This consent can be immediate or it can be given beforehand as a pre-condition to lawful participation in an activity. Thus, many professional sportspeople and people involved in other vocations (such as the military) undertake to submit themselves to certain forms of testing if and when required. Apart from these consensual situations it is unlawful for any person to demand a bodily sample or take it by force except where expressly authorised by statute. As a general rule, the only situation in which it is permissible to take such samples by force is for purposes of detection and investigation of crime."