After a high-profile campaign to oppose the Dakota Access Pipeline in 2016, a number of states moved to make it harder to protest oil and gas projects. Now in Louisiana, the first felony arrests of protesters could be a test case of these tougher laws as opponents vow a legal challenge. The controversy here is over the Bayou Bridge Pipeline, the last leg of the Dakota Access. If completed, it will bring crude oil from the Bakken oil fields of North Dakota, through Louisiana, where it will be exported abroad. On a recent day, deep in the Atchafalaya swamp of South Louisiana, twigs snap under the rubber boots of about 40 protesters as they march through shaded woods. Many have tied bandannas around their faces, leaving only their eyes exposed. In the distance, backhoes fling mud as construction workers clear a path for the new Bayou Bridge Pipeline. "Y'all are trespassing!" a construction worker shouts. "Go home!" a protester yells back.After a few minutes, the construction workers shut off their equipment and the protesters celebrate. But later, things get heated after the sheriff's department shows up. A deputy pins one woman to the ground, and the two sides engage in a muddy tug of war until she tumbles free. It's incidents like this that have helped push lawmakers to take action. Earlier this year, Louisiana state Rep. Major Thibaut proposed a bill with stricter penalties for pipeline protesters."You know that there's a right way to do things and a wrong way," Thibaut told a state legislative committee. "And if you want to protest against something ... get your permit and you go do it in a legal fashion."Trespassing in Louisiana is normally a misdemeanor offense. But the new law deems oil and gas pipelines to be "critical infrastructure," a classification that includes places like nuclear plants, oil refineries and water treatment facilities. As of Aug. 1, trespassing near oil and gas pipelines in the state is now a felony offense, with a possible sentence of up to five years in prison. Several states have either passed or are considering similar laws, including Oklahoma, Iowa and Pennsylvania.The oil and gas industry is a big part of many states' economies, including Louisiana. Craig Stevens, who represents pipeline interests with Grow America's Infrastructure Now, says these new laws will help ensure pipelines are not delayed and will also help keep both workers and protesters safe. "It wasn't too long ago when there were, I think, four protesters that broke through and tried to penetrate, and actually did pierce a pipeline up in the Midwest," he says. "And they usedblowtorches. I mean that's the type of thing could actually explode and kill somebody." There were two such cases, and in both the pipelines were empty at the time.Pipeline opponents say more than 10 people have been arrested under Louisiana's stricter law. Journalist-activist Karen Savage captured the first arrests on video, which shows several security officers pulling three protesters from kayaks onto an airboat.Those arrested said they didn't think they were doing anything illegal since they were on water, which is considered public property."It's a ridiculous over-criminalization of people who protest," says Bill Quigley, a law professor at Loyola University in New Orleans who represents protesters here and in other states. Quigley calls the new law unconstitutional on First Amendment grounds, and he says he plans to challenge it in court. He hopes doing so will encourage other states to walk back their own laws. So far, it's not clear whether the local district attorney will prosecute those charged with felonies. But at the Bayou Bridge protest, anti-pipeline organizer Cherri Foytlin says she and others won't be deterred. "I hope to God no more felonies," she says. "But if there is, then they will be righteous ones."The next day, Foytlin and three others were also arrested. Copyright 2018 WWNO - New Orleans Public Radio. To see more, visit WWNO - New Orleans Public Radio.