A DUI checkpoint is a place where every driver must stop while an officer determines whether they are intoxicated. This might happen on New Year’s Eve, for example. DUI checkpoints are illegal in many states because they allow the police to check sobriety without any particular cause for suspicion. Generally speaking, DUI checkpoints are legal in Colorado. However, DUI checkpoints are illegal under certain circumstancesーif they are conducted in a manner that constitute racial profiling, for example.