"I'm infuriated and everybody else should be infuriated," Bland's sister, Sharon Cooper, told reporters.
Bland, who authorities say hanged herself in her jail cell, was not clinically diagnosed with depression or on any medication and was "ecstatic" at the prospect of starting a new job at her alma mater in Texas, family attorney Cannon Lambert said at a press conference.
"Why is it that a 28-year-old woman who had received two job offers take her own life? Why would she call her mom in excitement about those jobs and take her own life?" Lambert asked.
But Waller County Sheriff R. Glenn Smith said Bland told the county jailer during her intake that she had previously tried to kill herself.
Authorities released jail intake forms late Wednesday that appear to show Bland answering "yes" to the following questions: Have you ever been very depressed? Do you feel this way now? Have you had thoughts of killing yourself in the last year? Have you ever attempted suicide?
The documents say she attempted suicide last year by taking pills.
But, later, on a different sheet, the word "no" appears next to questions about mental illness and attempted suicide. A reason for the apparent discrepancy was not immediately clear.
"I have a hard time dealing with inconsistency and that seems to have been the theme over the last couple of days here," Cooper told CNN's "Erin Burnett OutFront."
She said the dashcam video clearly showed the trooper was not threatened and took her younger sister into custody merely because his "ego was bruised."
"But when you tell me that you're going to 'light me up' I feel extremely threatened and concerned and I'm not going to get out of my car," she said of the trooper's words and actions.
Lambert said the possibility of a lawsuit has not been ruled out.
"If you look at the dashcam, I think that you see right out of the gate that this could have easily been avoided," he said.
The family said the video has raised even more questions over whether Bland should have been arrested at all. They're arranging her funeral.
"We have successfully been able to go and get our sister and daughter and bring her home," Lambert said. "The family is preparing for the homegoing celebration."
The dashcam video shows Texas state Trooper Brian Encinia pulling Bland over on July 10 for allegedly failing to use her turn signal. What started as normal conversation gets testy after Encinia asks her to put out her cigarette.
"I am in my car. Why do I have to put out my cigarette?" Bland says.
"You can step on out now," Encinia replies.
Bland refuses to get out of her car, and the trooper opens her door and starts trying to pull her out of the vehicle.
What happens after that has ignited a debate about what the officer could have done versus what he should have done.
'For a failure to signal?'
In the video, Encinia tells Bland she is under arrest. She repeatedly asks why, but the trooper does not answer, other than to say, "I am giving you a lawful order."
They argue, then Encinia pulls what appears to be his Taser and points it at Bland.
He screams: "Get out of the car! I will light you up! Get out! Now!"
Bland then exits the car of her own accord, saying: "Wow, really, for a failure to signal? You're doing all of this for a failure to signal?"
Much of what happens next is not seen on camera, but the officer can be heard saying Bland is not compliant.
"When you pull away from me, you're resisting arrest," Encinia says.
A clearly upset Bland can be heard saying: "You're a real man now. You just slammed me, knocked my head in the ground. I got epilepsy you mother******."
"Good," he replies.
A female officer tells Bland she should have thought about that before she started resisting.
"I simply feel the officer was picking on her," Cooper said of her sister.
What's the legality here?
Technically, a driver can get arrested in Texas for failing to use a turn signal.
In the video, Encinia tells Bland he intended to give her a warning, until she failed to comply with orders and repeatedly cursed at the trooper.
"You were getting a warning ... until now," Encinia says. "You're going to jail."
CNN law enforcement analyst Harry Houck said the trooper did have the right to ask Bland to get out of the car and then try to pull her out of the vehicle.
"The fact is an officer can make an arrest anytime ... you run a red light, parking ticket, anything like that," Houck said. "What he did was he notices she was agitated."
But Houck, a retired New York Police Department detective, said the video concerned him.
"The one problem I have was just that he told her to get out of the car because she wouldn't stop smoking."
CNN legal analyst Sunny Hostin said she advises people that "when you have a police encounter, you want to make it as short and sweet as possible."
"But I don't think that he had the right to ask her to get out of the car because not putting out your cigarette is not cause for an arrest."
Texas Department of Public Safety Director Steven McCraw said Encinia has been taken off the street and has been assigned administrative duties pending the outcome of an investigation.
"We have certain procedures in place, and he did not comply with those procedures," McCraw said. "One of the many procedures is letting the individual know in terms of what actions are going to be taken."
The director also said, "A DPS state trooper has an obligation to exhibit professionalism and be courteous throughout the entire contact, and that wasn't the case in this situation."
What's the response?
Cooper thanked the public for rallying around her family since Bland's death.
"She has been in the minds and thoughts of everybody," Cooper said. "Please keep tweeting, keep Facebooking and Instagraming."
Emotions ran high as people across the country watched the video.
"Just watched about 20 minutes of Sandra Bland's traffic stop," one person tweeted. "(I don't know) if I've ever been so heated. I can feel my blood boiling."
"Half of my family (including my mother) works in law enforcement," Ashley C. Ford tweeted. "I am well aware of my rights. Sandra Bland should've never been arrested."
Encinia has not spoken publicly about the incident. But he gave his account in his arrest warrant affidavit
, as reported by CNN affiliate KPRC-TV in Houston.
The trooper wrote that Bland became "combative and uncooperative" and that she was placed in handcuffs "for officer safety."
"Bland began swinging her elbows at me and then kicked my right leg in the shin," Encinia said. "I had a pain in my right leg and suffered small cuts on my right hand. Force was used to subdue Bland to the ground to which Bland continued to fight back."
Encinia also wrote that Bland "was placed under arrest for Assault on a Public Servant."
Why problems with video?
The Texas Department of Public Safety released almost an hour of dashcam video. But in parts of the footage, the video is looped while the officer's audio continues uninterrupted.
For example, there are moments when a car or wrecker driver appears in the frame, suddenly disappears and then appears once again.
But the video of the traffic stop was not edited, according to Texas Department of Public Safety public information officer Tom Vinger. "There was a technical issue during posting later in the video, and we are working to correct," Vinger said.
The Texas Department of Public Safety released a new version of the video late Wednesday, which was a few minutes shorter than the previous version, and appears not to have the same problems.
Murder or suicide?
While the video of Bland's arrest may be startling, it still doesn't explain how she died in jail three days later.
According to the Waller County Sheriff's Office, Bland was found "in her cell not breathing from what appears to be self-inflicted asphyxiation." She received CPR, and an ambulance came, but she was pronounced dead a short time later.
Authorities said Bland apparently hanged herself with a trash bag from a metal barrier that separated the bathroom from the rest of the cell.
There were no cameras inside her cell, but cameras in the hallway showed no one entering or leaving before the discovery of her body.
Bland's relatives said they don't believe the 28-year-old would have killed herself. They said she had just moved to Texas and looked forward to her new job as a student ambassador to the alumni association at Prairie View A&M University, her alma mater.
Waller County District Attorney Elton Mathis promised a thorough and exhaustive review of the case, which will be presented to a grand jury.
"It has not been determined at this point that this was a murder. This investigation is being conducted as a murder investigation would," Mathis said. "Whatever the ultimate determination may be, whether that's a suicide or a homicide, that will ultimately be decided by a grand jury."
Mathis said Bland's family had made "valid points that she did have a lot of things going on in her life that were good."
But investigators were examining online videos posted by Bland in March in which she talked about battling depression and post-traumatic stress disorder, according to Mathis.
He also said preliminary autopsy results indicate she had marijuana in her system and cutting scars on her arm.
Sharon Cooper said her sister hadn't been diagnosed with either depression or PTSD and that her video message was intended to be inspirational to people feeling the same way.
The Texas Rangers and the FBI are also investigating Bland's death.
"I completely understand why the Bland family and why the nation itself sees this situation as extremely suspicious," Mathis said.
"We're dealing with a young woman who had devoted her life to the cause of African-American suffering -- African-Americans being picked on by law enforcement -- and the irony of her winding up dead in a small jail in the South part of the United States is not lost on me at all."