their agent or attorney, duly authorized, by power of
attorney, in writing, acknowledged and certified under the seal of some
legal office or court of the State or Territory in which the same may be
executed, _may pursue and reclaim such fugitive person_, either by
procuring a warrant from some one of the courts, judges, or
commissioners aforesaid, of the proper circuit, district or county, for
the apprehension of such fugitive from service or labor, or by seizing
and arresting such fugitive where the same can be done without process,
and by taking and causing such person to be taken forthwith before such
court, judge or commissioner, whose duty it shall be to hear and
determine the case of such claimant in a summary manner; and upon
satisfactory proof being made, by deposition or affidavit, in writing,
to be taken and certified by such court, judge, or commissioner, or by
other satisfactory testimony, duly taken and certified by some court,
magistrate, justice of the peace, or other legal officer authorized to
administer an oath and take depositions under the laws of the State or
Territory from which _such person owing service or labor_ may have
escaped, with a certificate of such magistracy or other authority, as
aforesaid, with the seal of the proper court or officer thereto
attached, which seal shall be sufficient to establish the competency of
the proof, and with proof also by affidavit, of the identity of the
person whose service or labor is claimed to be due as aforesaid, that
the person so arrested does in fact owe service or labor to the person
or persons claiming him or her, in the State or Territory from which
such fugitive may have escaped as aforesaid, and that said person
escaped, to make out and deliver to such claimant, his or her agent or
attorney, a certificate setting forth the substantial facts as to the
service or labor due from such fugitive to the claimant, and of his or
her escape from the State or Territory in which such service or labor
was due to the State or Territory in which he or she was arrested, with
authority to such claimant, or his or her agent or attorney, to use such
reasonable force and restraint as may be necessary under the
circumstances of the case, to take and remove such fugitive person back
to the State or Territory from whence he or she may have escaped as
aforesaid. In no trial or hearing under this act shall the testimony of
such alleged fugitive be admitted in evidence; an