Some of them will.
An employer can do a background check for the past 15 years
There is no time limit on how far back a background check can go. Any criminal conviction can be looked at no matter how long ago it was.
The military will have individuals fill out a medical health survey. If they lie about their past conditions, they can be subject to court martial and dis-honorable discharge. And a background check will often reveal medical related information in billing.
Nope, but a reference check will do the trick. If they call your past employers for a reference check, they'll more than likely find out.
No.
Before filling out a police officer application, find out what information the police department will see about you on a background check. It's easy to forget about an old parking ticket or college shenanigans, but police agencies will learn everything about you. Don't run the risk of accidentally lying about your past. Order your own background check so you can see any past violations you'll need to reveal on your police officer application.
They can go as far back as they wish with the exception of certain items which can only be searched 7 years into the past those items are bankruptcies, tax liens, and judgments.
Update cases
When a person is charged with assault, an employer can do a background check to look at a persons criminal past. The only way to get the charge off of your record, is to return to court and ask the judge if it can be expunged.
Yes, if the employer pays for a judgment search to take place. However, judgments can only legally reported under FCRA for the past 7 years to conduct a judgment search.
If the bench warrant was entered into the interstate system it will show up. If it was not, no, it won't. However - a criminal background check of your past WILL reveal any former criminal activity among which will quite probably be the offense for which you are wanted.
It depends on how important it is to that particular employer. You should pretty much always assume they will find out everything. Most employers are going to be more upset to dig up something far in your past than they would be if you told them about it up front.