In 2004, when Tanesha Bannister was 29, a judge sentenced her to life in prison for selling crack, convincing the single mother of two she'd never be free again.

Two decades earlier, the country had responded to the crack cocaine epidemic with laws that hoped to stem both violence and social decay caused by low-cost crack cocaine. Over time, the 1986 law mandating a 100-to-1 crack versus powder cocaine sentencing ratio marooned millions of Americans, mostly black men, in Americas prison system.

But as her time in prison stretched on, Bannister, who is black, began to question the legitimacy of her punishment for a non-violent crime. She petitioned the administrations of President Barack Obama and President Donald Trump for a reprieve to no avail.

Then, in May, she became one of the more than 4,500 people released or who have seen their prison terms shortened since December 2018, when Trump signed into law one of the most significant changes to the federal criminal justice system in the 21st century.

"Basically after being let down for so many times ... it was just like life was breathed all over again," Bannister, now 45, said.

Nearly a year after the First Step Act's passage, NBC News spoke to over a dozen people, including former and current elected officials, liberal and conservative advocates, and formerly incarcerated individuals, among others, who championed the reforms. They all agreed that the law's effects are tangible, and many believe the bipartisan coalition that produced it appears durable.

I think the biggest win is that this is now a safe issue after years and years and years of the two parties trying to use criminal justice as a way to tear each other down, said Jessica Jackson, co-founder of #cut50, a bipartisan criminal justice reform nonprofit.

However, some are skeptical the alliance can hold. Many of the next steps advocates have underscored as necessary to bring about true change, like reexamining lengthy sentences for violent offenses and restructuring policing practices, may be a tougher sell.

"As some people might say, it's easier to kind of agree on some of the low-hanging fruits, but the higher you reach, the more difficult consensus is going to be, said Tim Head, the executive director for the Faith & Freedom Coalition, a conservative nonprofit that supports the act as well as other criminal justice reform efforts.

More than 3,000 inmates have been released and another roughly 1,700 people convicted of crack cocaine offenses have seen their sentences reduced thanks to the First Step Act, according to data from the Federal Bureau of Prisons and the U.S. Sentencing Commission. Some of that activity stems from a 2011 change made by the federal sentencing commission affecting people convicted of certain drug crimes and a provision of the First Step Act. That provision made the sentencing guidelines of the Obama-era Fair Sentencing Act of 2010 retroactive.

The majority of those released under both acts have been black men, the group which the "war on drugs" campaign of the '70s and '80s effectively targeted.

But the effects of the act's other major provision the relaxing of the notorious "three strikes" rule to mean a 25-year sentence, rather than life in prison, for three or more convictions are so far difficult to measure. A year in, little data has been collected around how many people had been sentenced under the new guidelines.

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The act also a required the development of a new risk assessment tool that aims to determine which inmates are most likely to re-offend if released and to identify ways to assist those who are released. It was completed in July. Meanwhile, roughly 16,000 federal prisoners have enrolled in drug treatment programs created by the act, according to the Justice Department.

The success or limitations of the tool and the new programs still remain to be seen, but advocates say the overall represent a major shift in thinking.

"It's part of wider system transformation from one that was based on gut instinct and anecdotes and headlines to decisions that are made based on evidence and research," said Adam Gelb, the founder of the Council on Criminal Justice, a bipartisan criminal justice nonprofit.

However, he added, the nuances of implementation matter.

"We're talking about human behavior and it's never going to be a perfect assessment of someone's readiness for release nor a perfect judgment about the length of time they deserve to spend behind bars for the purposes punishment," he said.

Head, the executive director of the Faith and Freedom Coalition, said the act's changes, which also include mandating BOP train its 31,000 employees on de-escalation techniques and mental health awareness, intended to shift "the culture of our federal system from pure punishment, to one of at least considering rehabilitation in a much more meaningful way."

The idea of rehabilitation and redemption, he said, is a core focus of conservative thought on the issue.

But, despite the sweeping reforms of the First Step Act, other experts say it's important not lose sight of the inmates who have been left out of the reforms and to start a conversion about about whether prison is the right punishment in a country that incarcerates more people than its peers.

"We have so much work to do to re-imagine our system of corrections, our system of justice, so we just need to be careful not to paint sort of a rosy picture of what's happening," Lauren-Brooke Eisen, an expert at the Brennan Center. "We still have more people behind bars under correctional supervision than any other country on the planet."

Advocates for the First Step Act, particularly left-leaning ones, describedits reformsashistoric but modest. True change will require looking to the heart of the system police interactions and what happens inside courtrooms, experts said. Right now, black Americans are more likely to be arrested for the same activities as white Americans, and more likely to be prosecuted, convicted and sentenced to longer jail terms.

It's understandable that people are frustrated with the pace of progress, said Gelb. At the same time, the criminal justice system is massive and fragmented. And it's going to continue to take some time to build the political will to tackle many of the more difficult issues.

Gil Kerlikowske, the former commissioner of U.S. Customs and Border Protection and drug czar under President Barack Obama, suggested that reformers look to the states. First Step covers the nearly 180,000 federal inmate population, and does not touch the roughly 1.3 million people in state prisons.

"I think that the states have been moving in this direction now for quite a while, he said. But I think the First Step Act sends a good signal nationally, because not all states are on board, and not all states move as aggressively."

To make a more significant dent in the nations prison population, attention must shift toward the roots of mass incarceration, said Tony J. Payton Jr., a Democrat and former Pennsylvania state lawmaker who championed state-level criminal justice reforms.

Weve got to basically dismantle that entire system, said Payton, who is now affiliated with the 20/20 Bipartisan Justice Center, a national and bipartisan coalition of black criminal justice reformers.

Payton's list of targets, however, points to some of the remaining contentious matters in criminal justice reform that could threaten the bipartisanship needed to implement them, such as sentencing reform for both non-violent and violent offenders, eliminating mandatory minimums, reforming police departments and eliminating prosecutorial immunity.

Lester Young Jr., a South Carolina statewide organizer for JustLeadershipUSA, a national criminal justice reform nonprofit, who was formerly incarcerated for murder, cited his own experience to argue that reforms for violent offenders must be made a priority.

Head said that this might make some conservatives uneasy.

"On the conservative side of the spectrum, there obviously still are plenty of people that feel like the most severe crimes or severe offenses need to be dealt with severely," Head said. "People on the right saying, 'This goes too far' and people on the left saying, 'This doesn't go far enough.'"

Bannister, released from the minimum-security penitentiary in Bryan, Texas, where she spent 16 years, now works as a personal care assistant for two health care companies back home in South Carolina.

She's turned her efforts to activism after being released, hoping to lobby state lawmakers to improve reentry for ex-offenders with resources such as housing and job training.

"There's a lot of work to do, but I'm willing to stand in the trenches and fight the good fight and if I can make a difference in getting a law passed or writing legislation, those are my goals," she said. "They're not things I want to fulfill but I will fulfill."

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The First Step Act promised widespread reform. What has the criminal justice overhaul achieved so far? - NBC News