In support of defendants’ contention that they were born in the United States, they produced one witness, Leong Fenn, a Chinese person, who swore that he was the uncle of defendants, and that they were both born in San Francisco. He identified defendants by photographs of them which are attached to the return herein. It further appears from this testimony that defendants were respectively 12 and 14 years old when they left this country for China. At the conclusion of witness’ testimony the United States District Attorney requested defendants to take the stand, in order that he might question them as to their recollection of events during the time it was sworn they were in the United States. This they declined to do. The commissioner finds that their refusal to be sworn is a discrediting fact, and sentences them to deportation.

A proceeding under our law to expel or exclude aliens is not a criminal prosecution or proceeding. Fong Yue Ting v. United States, 149 U. S. 730, 13 Sup. Ct. 1016, 37 L. Ed. 905; U. S. v. Lee Huen (D. C.) 118 Fed., at page 456. This court has held (U. S. v. Lee Huen, supra):

“If defendants fail to give testimony in tbeir own behalf, and explain doubtful matters peculiarly within their own knowledge in these deportation eases, * * * such fact may be considered by the court or commissioner.”

This court has many times observed in similar cases that the stereotyped testimony of a single witness, such as is here offered, is so un*227satisfactory as to justify a commissioner in regarding it with grave suspicion. If, now, defendants refuse to testify, and thus explain and corroborate, it would seem that the commissioner had a right, in the fair exercise of judicial discretion, to hold that defendants had not proved to his satisfaction their right to remain in the United States. This is especially true when, as .here, the evidence of the single witness is not of a convincing nature. This court does not believe the witness knew anything about the birth of the defendants, and will not hold, as matter of law, the commissioner should have credited what the court will not and does not credit.

Judgment and order of deportation affirmed.