In effect, a person can be compelled to give involuntary self-incriminating evidence, but only where that evidence is to be used against a third party.
It held that the ability of environmental protection authorities to demand information that could potentially be self-incriminating was not the same as requiring people incriminate themselves in trials.
Police made such threats in particular against female detainees in the presence of male relatives to force the men to sign self-incriminating statements.