A newly released video recorded by Sandra Bland, a black woman found dead in a Texas jailhouse three days after a confrontational traffic stop by a white state trooper in 2015, is raising new questions about an incident that helped launch the Black Lives Matter movement.

Bland’s family is demanding her case be reexamined after the 39-second video, obtained by the nonprofit journalism organization Investigative Network, was aired Monday night in Dallas TV station WFAA.

“Open up the case. Period,’’ Bland’s sister, Shante Needham, told WFAA. “We know they have an extremely, extremely good cover-up system.”

Bland, 28, was discovered hanging in her jail cell outside Houston days after being arrested in July 2015. The circumstances leading to her death, which was ruled a suicide, sparked large protests and became a flash point in the debate over the treatment of black people by police.

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