EXHIBIT 5

                        Robinson, Bradshaw & Hinson, PA
                                Attorneys at Law
                            One Independence Center
                       101 North Tryon Street, Suite 1900
                        Charlotte, North Carolina 28246
                           Telephone: (704) 377-8388
                              Fax: (704) 373-3988
                                  May 23, 2002



aaiPharma Inc.
2320 Scientific Park Drive
Wilmington, North Carolina 28405

         Re:      Registration Statement on Form S-4

Ladies and Gentlemen:

         We have acted as counsel to aaiPharma Inc., a Delaware corporation (the
"Company") and to the subsidiaries of the Company listed on Schedule I hereto
(collectively, the "Guarantors"), in connection with the above-referenced
Registration Statement (the "Registration Statement") on Form S-4 under the
Securities Act of 1933, as amended (the "Securities Act") relating to the
issuance by the Company of $175 million in aggregate principal amount of the
Company's 11% Senior Subordinated Exchange Notes due 2010 (the "Exchange Notes")
and the issuance by the Guarantors of the guarantees with respect to the
Exchange Notes (the "Exchange Guarantees"). The Exchange Notes and the Exchange
Guarantees will be issued under the Indenture dated March 28, 2002 (the
"Indenture") between the Company, the Guarantors, and Wachovia Bank, National
Association, as trustee (the "Trustee") and will be offered by the Company (the
"Exchange Offer") in exchange for an equivalent principal amount of the
Company's currently outstanding 11% Senior Subordinated Notes due 2010 (the
"Original Notes").

         In connection with the opinions set forth below, we have examined the
Registration Statement, the Indenture and forms of the Exchange Notes and the
Exchange Guarantees. We also have examined the originals, or duplicates or
certified or conformed copies, of such records, agreements, instruments or other
documents as we have deemed necessary or appropriate. In rendering the opinions
set forth below, we have assumed (i) the genuineness of all signatures, (ii) the
legal capacity of all natural persons, (iii) the authenticity of all documents
submitted to us as originals, and (iv) the conformity of photostatic copies, and
the authenticity of originals of such documents. As to certain various factual
matters relevant to the opinions set forth below, we have relied upon
certificates and oral and written statements and representations of public
officials and officers of the Company and the Guarantors, and we have not
undertaken any independent investigation to determine the existence or absence
of any such facts. We also have assumed that the Indenture is a valid and
legally binding obligation of the Trustee.




aaiPharma Inc.
May 23, 2002
Page 2

         Based upon the foregoing, and subject to the qualifications and
limitations stated herein, we are of the opinion that:

         1.       When (a) the Registration Statement becomes effective, (b) the
                  Indenture has been duly qualified under the Trust Indenture
                  Act of 1939, as amended, and (c) the Exchange Notes have been
                  duly executed, authenticated, issued and delivered in
                  accordance with the provisions of the Indenture upon the
                  exchange, the Exchange Notes will constitute legal, valid, and
                  binding obligations of the Company, and will be entitled to
                  the benefits of the Indenture.

         2.       When (a) the Registration Statement becomes effective, (b) the
                  Indenture has been duly qualified under the Trust Indenture
                  Act of 1939, as amended, (c) the Exchange Notes have been duly
                  executed, authenticated, issued and delivered in accordance
                  with the provisions of the Indenture upon the exchange, and
                  (d) the Exchange Guarantees have been duly issued, the
                  Exchange Guarantees will constitute legal, valid and binding
                  obligations of the Guarantors, and will be entitled to the
                  benefits of the Indenture.

         We render no opinion herein as to matters involving the laws of any
jurisdiction other than the states of North Carolina and New York, the federal
law of the United States typically applicable to the transactions contemplated
by the Exchange Offer, and the corporate laws of the states of Delaware and
Kansas and the Commonwealth of Massachusetts.

         This opinion letter is limited to the matters stated herein, and no
opinion is implied or may be inferred beyond the matters expressly stated.

         We hereby consent to the reference of our firm under the heading "Legal
Matters" in the Registration Statement and to the filing of this opinion with
the Securities and Exchange Commission as an Exhibit to the Registration
Statement. In giving such consent, we do not concede that we are experts within
the meaning of the Securities Act or the rules and regulations thereunder or
that this consent is required by Section 7 of the Securities Act.


                                           Very truly yours,



                                           ROBINSON, BRADSHAW & HINSON, P.A.

                                           /s/ Robinson, Bradshaw & Hinson, P.A.




                                   SCHEDULE I

                                  SUBSIDIARIES

Applied Analytical Industries Learning Center, Inc.
AAI Technologies, Inc.
AAI Properties, Inc.
Kansas City Analytical Services, Inc.
Medical and Technical Research Associates, Inc.
NeoSan Pharmaceuticals Inc.
AAI International Inc.
AAI Japan, Inc.