When the government acts as controller of prisons, it has broad abilities to limit the free speech of inmates. Essentially any restriction that is "reasonably related to legitimate penological interests" is valid.[75] This broad power also extends to pretrial detainees and even convicts who are on probation or parole.[76] The only limit recognized by the Court is that the prison must provide an "alternate means of exercising that right" of speech, an alternate channel, that still allows legitimate speech to be expressed.