On Sat, 27 Mar 2004 10:54:48 -0500, "Kevin Brooks"
wrote:

None of which answers the question of when it became a standard feature, to
include being used in the ANG.

Seems to prove all the other articles that can easily be found by
searching google that give regs, dates and such aren't a bunch of
bull. The labs were in place by 1971 and testing increased
dramatically in 1972.