Norarization would not be permitted if the attorney was a beneficiary. Many attorneys are also notaries for the convenience of their clients, and there is no conflict of interest in notarizing a signature on a document prepared by an attorney for the benefit of a client.
The above is general legal and business analysis. It is not "legal advise" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
As the previous two attorneys state there is no legal or ethical reason that the attorney can not act as a notary unless he is either named in the document as a trustee or beneficiary.
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It is very common in California for the drafting attorney to act as the notary of the trust and even serve as a witness to the execution of the will.
The notary's duties is to certify that the person who was supposed to sign the document actually signed the document.
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