Postal Service needs traceable postmark system

To the editor:

Clearly, the threat of anthrax in the mail still exists. The letters in question apparently have no traceable postmark. I would recommend that an infrared-reactive and scannable ink be introduced in the postmark on all U.S. Postal Service mail. This would be a means to scan the mail to ensure that each piece bears a valid, traceable postmark.

VERN DAVIDSON JR.

Local 4088

American Postal Workers Union

Cape Girardeau