SECURITIES AND EXCHANGE COMMISSION

                             Washington, D. C. 20549

                                   FORM 8-K

                               Amendment No. 1

                                Current Report

                     Pursuant To Section 13 or 14(d) of the

                         Securities Exchange Act of 1934

         Date of Report (Date of earliest event reported) June 26, 2002
                                                          -------------

                            PSYCHEMEDICS CORPORATION
             ------------------------------------------------------
             (Exact Name of Registrant As Specified In Its Charter)

                                    DELAWARE
                 ----------------------------------------------
                 (State if Other Jurisdiction of Incorporation)

          1-13738                                        58-1701987
  ------------------------                 ------------------------------------
  (Commission File Number)                 (I.R.S. Employer Identification No.)

1280 Massachusetts Ave., Suite 200, Cambridge, MA                   02138
- -------------------------------------------------                 ----------
    (Address of Principal Executive Offices)                      (Zip Code)

                                 (617-868-7455)
              ----------------------------------------------------
              (Registrant's Telephone Number, Including Area Code)

                                       N/A
          -------------------------------------------------------------
          (Former Name or Former Address, if Changed Since Last Report)


ITEM 4.   CHANGES IN REGISTRANT'S CERTIFYING ACCOUNTANT.

(a)  Information required by Item 304(a)(1) of Regulation S-K.

     (i)   Arthur Andersen LLP was dismissed as the Registrant's independent
           accountants effective as of the close of business on June 26, 2002.

     (ii)  The reports of Arthur Andersen LLP on the consolidated financial
           statements of the Registrant at December 31, 2000 and December 31,
           2001, and for the three years ended December 31, 2001, contain no
           adverse opinion or disclaimer of opinion and were not qualified or
           modified as to uncertainty, audit scope or accounting principle.

     (iii) The decision to change accountants was recommended by the Audit
           Committee of the Registrant's Board of Directors, and approved by the
           full Board of Directors of the Registrant. A new independent public
           accounting firm has not yet been engaged to act as Psychemedics
           Corporation's auditors.

     (iv)  In connection with its audits for the two most recent fiscal years
           and through June 26, 2002, there have been no disagreements with
           Arthur Andersen LLP on any matter of accounting principle or
           practice, financial statement disclosure, or auditing scope or
           procedure, which disagreements if not resolved to the satisfaction of
           Arthur Andersen LLP would have caused Arthur Andersen LLP to make
           reference thereto in their report on the financial statements for
           such years.

     (v)   During the two most recent fiscal years and through June 26, 2002
           there have been no reportable events (as defined in Regulation S-K
           Item 304 (a) (1) (v)).

(b)  The Registrant has requested that Arthur Andersen LLP provide it with a
     letter addressed to the SEC stating whether or not it agrees with the above
     statements. A copy of such letter, dated June 28, 2002, is filed as Exhibit
     16 to this Form 8-K/A.

Item 7.   FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

(c)  Exhibits

EXHIBIT NO.         DESCRIPTION

   16               Letter from Arthur Andersen LLP to the Securities and
                    Exchange Commission dated June 28, 2002.

                                    SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this Report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                     PSYCHEMEDICS CORPORATION
Dated: June 28, 2002


                                     By: /s/ Peter C. Monson
                                        ----------------------------------------
                                        Peter C. Monson, Chief Financial Officer


                                  EXHIBIT INDEX

EXHIBIT NO.         DESCRIPTION

   16               Letter from Arthur Andersen LLP to the Securities and
                    Exchange Commission dated June 28, 2002.