RETRACTABLE TECHNOLOGIES, INC. TO PARTICIPATE IN AMERICAN STOCK EXCHANGE ONLINE CONFERENCE JUNE 19 RETRACTABLE TECHNOLOGIES, INC. TO PARTICIPATE IN AMERICAN STOCK EXCHANGE ONLINE CONFERENCE JUNE 19 Little Elm, TX, June 15, 2001- — Retractable Technologies, Inc. (AMEX: RVP), a leading maker of safety needle devices, announced today that it will