The Technology, Education and Copyright Harmonization Act TEACH Act was enacted in 2002 as an amendment to Section 110(2) of the Copyright Act.
It is, in fact, simply the current version of Section 110(2) and is not a separate law.
ALA's Distance Education and the TEACH Act : American Library Association (ALA) documents and explains in details the legislative history, the meaning and importance of the TEACH Act.
TEACH Act Checklist in the Copyright Crash Course by the University of Texas Libraries.