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I am sorry to hear about this situation. On this website, I do not always get to give good news, and this is one of these times.
can I request to be paid?
Yes, but a meager amount. Per § 5903, the amount a witness can demand is $20 per day, "7¢ for each mile circular actually and necessarily travelled between the place named in the subpoena and the place of residence of the witness," and "when a matter is prolonged from one day to the next a witness necessarily present on both days who resides more than 50 miles by the usually-travelled route from the place named in the subpoena and who remains there overnight shall be paid commutation of lodging and subsistence for each such night in an additional amount equal to the per diem witness fee"
Do I have to show if I feel I can not be favorable due to bad blood?
Yes. A subpoena is mandatory - it is enforceable.
Is there anyway to not appear?
A subpoena may be quashed on the following grounds: privileged information, request is too vague, inadequate time to respond, or burdensome travel. However, the reasons have to be real, and proven - and one has to file a motion to quash and have it heard to have the Court possibly agree. Otherwise, one has to show.
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