Many businesses do background checks on prospective employees. The managers of some apartment buildings do a "background check" on a person before they allow that person to rent an apartment.
Some jobs require a security clearance from the government, and those people are given a much more thorough investigation.
There are so many businesses that want to do background checks that some businesses have been created specifically for doing it for businesses that cannot do it themselves.
Since background checks are considered acceptable for businesses, why are we not allowed to investigate people in the 9/11 movement?
There are specific tactics which disinfo artists tend to apply, as revealed here. Also included with this material are seven common traits of the disinfo artist which may also prove useful in identifying players and motives. The more a particular party fits the traits and is guilty of following the rules, the more likely they are a professional disinfo artist with a vested motive.
Ignore the flame bait. Don't respond to personal attacks other than to point out the use of disinformation techniques (stay on point too). Realise that their purpose is to waste our time, and you wasting your time and others fullfills that purpose. Don't directly name call. Let people see for themselves that they fit the characteristics of a disinfo agent. Stay cool headed and out of the personal attacks scene.
I know it's hard to do what's right all the time. Just do what you can. -Thanks