Cornelius D. Wynkoop of the Mayor's Squad, New York City, lived a varied life for the times, and ran afoul of the law on a couple of occasions.

    Richard Wynkoop, in the 1904 edition of the Wynkoop Genealogy in the United States of America, has this to say about him on pages 203-204:

    1450. Cornelius De Witt Wynkoop, (Genl. Cornelius E. 896, Evert C. 517, Maj. Cornelius E. 295, Capt. Evert 112, Cornelius 28, Evert 4, Cornelius 1,) born April 6, 1830: died January 9, 1899, in the Seney Hospital, Brooklyn, N. Y., after a surgical operation: married, 1st, April 4, 1858, Harriet Pook, from England, who died October 21, 1889. He married, 2d, April 10, 1892, in Brooklyn, Mrs. Mary Annie (Miller) Scrymser, widow of Charles Arlington Scrymser.
    He was, at one time, on the police force of the city of New York: and he was afterwards a printer, and, at the time of his death, was a member of the printing firm of Wynkoop & McKay. He was a teacher in the Sabbath School of the Tabernacle, Brooklyn.
    Children of Cornelius D. and Harriet Wynkoop:
1703. Cornelius Evert: b. June 14, 1859: m. Emma Frances Walker, known as Frank. They live at Rhinebeck, N. Y.
1704. Mary Elizabeth: b. June 1, 1869: m., Apl. 15, 1891, in Brooklyn, John Duncan Duff, who d. in New Haven, Conn., in June, 1902.

    Frankly, I'm not convinced by the evidence presented against him in either case. Read the newspaper reports yourself and see what you think.

    Chris

Officer Cornelius D. Wynkoop Makes an Arrest.
     From the New York Daily Times, Wednesday, 2 September, 1857, p. 3.

The Gift Enterprise Business.
     From the New York Times, Saturday, 20 March, 1858, p. 5.

Transactions of the Mayor's Squad. Charges Against Policeman Wynkoop.
     From the New York Times, Thursday, 3 March, 1859, p. 8.

The Charges Against Officers of the Mayor's Squad.
     From the New York Times, Saturday, 5 March, 1859, p. 1.

The Investigation of the Charges against Officer Wynkoop is Concluded.
     From the New York Times, Monday, 7 March, 1859, p. 4.

Accused of Printing Obscene Poems.
     From the Brooklyn Daily Eagle, Sunday, 28 September, 1890, p. 3.

Wynkoop Denies the Charges, Comstock Says He Prints Obscene Matter and Circulars for Green Goods Men.
     From the Brooklyn Daily Eagle, Sunday, 28 September, 1890, p. 20.

Marriage Notice - Duff-Wynkoop.
     From the Brooklyn Daily Eagle, Thursday, 16 April, 1891, p. 1.

Wynkoop-Scrymser.
     From the Brooklyn Daily Eagle, Wednesday, 13 April, 1892, p. 1.

Died, C. D. Wynkoop.
     From the Brooklyn Daily Eagle, Wednesday, 11 January, 1899, p. 5.