I am participating in a high school mock trail for my AP government class. Explaining the case's situation would not be possible because of the character limit.
In Texas Road blocks are unconstitutional. So no, officers cannot merely stop cars based on a profile. An officer must have reasonable suspicion that some type of crime is being committed.
Actually road blocks are NOT unconstitutional in Texas, BUT you must follow very strict rules to have one and the rules make it very hard to do.
However, profiling IS unconstitutional. You should Google "supreme court profiling" and check out the articles on the issue.
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You have 2 separate issues; roadblocks and profiling. Roadblocks CAN be instituted by law enforcement under certain parameters, but profiling is unconstitutional. I would focus on the restrictions and circumstances placed on law enforcement where roadblocks were permissible.
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