Final answer:
Yes, DWI checkpoints are legal in Louisiana and have been established as constitutional by the Supreme Court. These checkpoints are set up by law enforcement to identify and apprehend drivers operating under the influence of alcohol or drugs.
Step-by-step explanation:
Yes, DWI checkpoints are legal in Louisiana. DWI stands for driving while intoxicated, and these checkpoints are set up by law enforcement officers to identify and apprehend drivers who are operating vehicles under the influence of alcohol or drugs. The legality of DWI checkpoints has been established by the United States Supreme Court.