How do you file a lawsuit against the companies that exposed veterns to agent orange?

Contractors for the government, are normally sanctioned by the Government.

In general, yes. Per the rules of civil procedure of many/most states, if your claim arises from the same underlying transaction or occurrence as the suit that was filed against you, it is considered...

Yes you can. Have to find the right law firm to do it.

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yes but it might cost more than the pool cost..