Chemical and biological sensors already in place on the National Mall will be supplemented with radiological detection equipment, including radiation pagers on the belts of some law enforcement officers.

CNN: Security at record high for WWII Memorial ceremony

Upon further consideration, however, the Top Tag does indeed seem to have some legitimate uses, as long as it's supplemented with an old-fashioned engraved ID tag for the computer illiterate.

ENGADGET: Top Tag Pet ID USB thumb drive