Probation has wide discretion to act, including unannounced home visits. That said, you have a legitimate security concern. You and your boyfriend should address this concern with his PO, and if necessary, the PO's Supervisor. be advised, however, that failure to grant access to the home may constitute a VOP (violation of Probation).
The probation officer has a lot of leeway in terms of unannounced visits, not letting him in can lead to a violation of parole for your boyfriend. If you have a real issue with your safety discuss this with the parole officer and/or his superiors.
The above answer is for information only; and does NOT constitute legal advice. This answer does not constitute, nor does it create, an attorney-client relationship between KaplunMarx, PLLC, Theodor Kapun and any receiver. The information provided on these pages is general only, and you should not act upon this information without consulting with a qualified attorney.
A probation officer can search your boyfriend's residence pretty much any time. The PO can go to search his residence for drugs, alcohol, guns or anything else that would violate the rules of probation. Your boyfriend does not have to be there while the search is being conducted