What is the likelihood of negotiating for Severence? What should the employee do now to ensure they have sufficient evidence?

You would need to check with a UK lawyer if any of their protections apply to your job here. In US, severance is not required.

Is my employer required to pay my full salary while I am serving Grand Jury Duty?

No. I believe you can decline to serve.

What are my legal options if I catch the boss inside the company car at my apartment complex?

I believe your only option is not to use the car for personal business. I don't believe it is illegal to track a company car even when it is used...

Can I file a lawsuit against the college for not being ADA compliant which make it extremely difficult to move around the campus

You can. You can contact a local employment attorney or the NYS Division of Human Rights.

Can an attorney request access to confidential download information for persons not involved in the case at hand?

If your friend receives a subpoena, he will need to retain an attorney to make a motion to quash the subpoena. That will involve a significant...

Is my supervisor allowed to restrict access to a "panic button"? Even if it is not company property?

There is no law requiring a panic button on the premises. If you feel unsafe, you need to quit.

Can I still sue after signing a severance package

Being weak from surgery is not a sufficient reason to void a written agreement that you signed. Not much less than signing with a gun pointed at...

You can be fired for mistakes, but must be paid for all hours you work with no deductions.

Is it legal to deny some employees paid holidays when the entire rest of the company receives this benefit?

The general rule is that if you are an hourly employee, there is no law that prohibits it as long as you are paid for the time you worked. You will...

Are companies that terminate a contract required to give the employee a written letter to show "cause" for the termination?

I agree that it depends on what you mean by a contract for 3 months. Many so called contracts are much less than that in reality. He can apply...