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Subpoena is a noun (a subpoena) and a verb (to subpoena).
A subpoena can be withdrawn or quashed.
Yes, they can serve you a subpoena on weekends.
If you were served with a subpoena then you need to appear.If you were served with a subpoena then you need to appear.If you were served with a subpoena then you need to appear.If you were served with a subpoena then you need to appear.
The plural form of subpoena is subpoenas.