American Science and Engineering, Inc. Added to Standard & Poor's SmallCap 600 Index.

BILLERICA, Mass. -- American Science and Engineering, Inc. (AS&E([R])) (NASDAQ: ASEI), a leading worldwide supplier of innovative X-ray detection solutions, has been added to the Standard and Poor's (S&P) SmallCap 600 index. Introduced in 1994, the S&P SmallCap 600 index accounts for approximately three percent of the U.S. equities market, and is designed to be an efficient portfolio of companies that meet specific inclusion criteria to ensure that they are investable and financially viable.

"We are pleased to be included in this well-known and widely followed index," said Anthony Fabiano, AS&E President and CEO. "AS&E's inclusion in the S&P SmallCap 600 will give our stock greater visibility, and reflects our continued focus on growth and long term commitment to increase shareholder value."

About Standard & Poor's

Standard & Poor's, a division of The McGraw-Hill Companies (NYSE:MHP), is the world's foremost provider of financial market intelligence, including independent credit ratings, indices, risk evaluation, investment research and data. The S&P Index Committee follows a set of published guidelines for maintaining the SmallCap 600 index. These guidelines include requiring the company be based in the U.S., have a minimum market capitalization of $200 million, and have four consecutive quarters of positive earnings. The complete details of these guidelines are available at www.standardandpoors.com/indices.

About AS&E([R])

American Science and Engineering, Inc. (AS&E) is the leading worldwide supplier of innovative X-ray inspection systems. With 50 years of experience in developing advanced X-ray security systems, the Company's product line utilizes a combination of technologies, including patented Z Backscatter technology, Radioactive Threat Detection (RTD), high energy transmission and dual energy transmission X-ray. These technologies offer superior X-ray threat detection for plastic explosives, plastic weapons, liquid explosives, dirty bombs and nuclear devices. AS&E's complete range of products include cargo inspection systems for port and border security, baggage screening systems for facility and aviation security, and personnel and passenger screening systems. AS&E systems protect high-threat facilities and help combat terrorism and trade fraud, drug smuggling, weapon smuggling, and illegal immigration and people smuggling. AS&E customers include leading government agencies, border authorities, military bases, airports and corporations worldwide, including the U.S. Department of Homeland Security (DHS), U.S. Department of Defense (DoD), U.S. Customs and Border Protection (CBP), North Atlantic Treaty Organization (NATO), HM Revenue & Customs (U.K.), Hong Kong Customs, and Abu Dhabi Customs. For more information on AS&E products and technologies, please visit www.as-e.com.

Safe Harbor Statement. The foregoing press release contains statements concerning AS&E's financial performance, markets and business operations that may be considered "forward-looking" under applicable securities laws. AS&E wishes to caution readers of this press release that actual results might differ materially from those projected in any forward-looking statements. Factors which might cause actual results to differ materially from those projected in the forward-looking statements contained herein include the following: significant reductions or delays in procurements of the Company's systems by the United States and other governments; disruption in the supply of any source component incorporated into AS&E's products; litigation seeking to restrict the use of intellectual property used by the Company; potential product liability claims against the Company; global political trends and events which affect public perception of the threat presented by drugs, explosives and other contraband; global economic developments and the ability of governments and private organizations to fund purchases of the Company's products to address such threats; and the potential insufficiency of Company resources, including human resources, capital, plant and equipment and management systems, to accommodate any future growth, and future delays in federal funding. These and certain other factors which might cause actual results to differ materially from those projected are detailed from time to time in AS&E's periodic reports and registration statements filed with the Securities and Exchange Commission, which important factors are incorporated herein by reference. AS&E undertakes no obligation to update forward looking statements to reflect changed assumptions, the occurrence of unanticipated events, or changes in future operating results, financial condition or business over time.