Cops overlook handgun in turnstile jumper’s waistband

Cops brought an accused turnstile jumper all the way to a police station — and marched him in front of a desk sergeant — before realizing the man was packing a handgun in his waistband, The Post has learned.

Ex-con Billy Walters, 37, walked through an emergency subway gate at the 149th street station without paying the fare around 11:45 a.m. Tuesday.

Cops took him to Transit District 11 near Yankee Stadium, but didn’t discover the .45 Sig Sauer in his waistband until they got him in front of the stations desk sergeant, according to a source and photo obtained by The Post.

The NYPD patrol guide states that a frisk should be conducted as soon as a person is taken into custody — with special attention given to the waistband.

Walters, who is homeless, was charged with criminal possession of a weapon and menacing, cops said.

NYPD officials did not immediately return a request for comment on the oversight.

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