For a search of a probationer's home by a probation officer to be considered an administrative search and not a criminal search:

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For a search by a probation officer to be considered an administrative search and not a criminal search, the officer must be pursuing probation-related objectives and not acting on behalf of the police. This means the search should not be solely for a criminal investigation but rather for the purpose of monitoring and enforcing the terms of probation. Probable cause and having an exact idea of what is being searched for are not necessarily required for an administrative search. The information prompting the search does not necessarily have to be personally observed by the probation officer.

For a Search of a Probationer's Home by a Probation