from Wikipedia...read it yourself (added spacing for emphasis):

From broad concern felt among Americans from both the September 11 attacks and the 2001 anthrax attacks, Congress rushed to pass legislation to strengthen security controls.

On October 23, 2001, Republican Rep. Jim Sensenbrenner introduced H.R. 3162 incorporating provisions from a previously sponsored House bill and a Senate bill also introduced earlier in the month.[5] The next day on October 24, 2001, the Act passed the House 357 to 66,[6] with Democrats comprising the overwhelming portion of dissent. The following day, on October 25, 2001, the Act passed the Senate by 98 to 1.[7]


Opponents of the law have criticized its authorization of indefinite detentions of immigrants; the permission given law enforcement officers to search a home or business without the owner’s or the occupant’s consent or knowledge; the expanded use of National Security Letters, which allows the Federal Bureau of Investigation (FBI) to search telephone, e-mail, and financial records without a court order; and the expanded access of law enforcement agencies to business records, including library and financial records.


Since its passage, several legal challenges have been brought against the act, and Federal courts have ruled that a number of provisions are unconstitutional.

As a manual shooter of all of a couple of months....when the advice is given "drag it back two stops" is that two F stops (2 Higher aperture numbers) or +/- ev 2 stops ie 2/10ths of a your existing fstop.

when you bracket are you changing the f or changing the +/- because EV-2 to +2 is all I have on my Sony and it can burn out or black out my image. I tend to slide it around a little whenever the highlight indicator flashes. 1 - 3 clicks between 0-1 can make a pleasing difference, 4 - 6 clicks from 0 - 2 wipes most of everything out.

shooting in Aperture priority or Shutter priority changes will be compensated by ISO and as such will allow 2 full f stops to be chosen. This is relevant in a whole host of ways: Shooting manual means it isn't quite so straightforward and so must be valid in less obvious ways.

I've read this "tip" several times in a variety of situations and I am confused.

Thank you for taking the time.

George