 Many living donor programs use extensive psychosocial screening as well as a lengthy consent process (Price 2000). Potential donors are screened for physical health, which is largely uncontroversial, but they are also screened for their motivations. The typical advice is to screen for excessive sense of duty, undue influence, unconscious internal neurotic influences, and abnormal emotional involvement. Screening of this nature is more controversial since it involves making difficult judgments about what counts as excessive in a sense of duty, undue in influence, and abnormal in emotional involvement, and it requires spotting neurotic influences. At least in the past, some critics have thought that transplant professionals have overused their power to refuse people as donors (MacFarquhar 2009).