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According to the US Supreme Court, it is unconstitutional for law enforcement to set up highway checkpoints to search for drugs, although the court has held that police agencies are within their rights to conduct such checks for highway safety purposes.
2. They should have support from the judicial system (i.e. the district prosecutor)
3. There must be established procedures for how to properly operate a checkpoint.
9. Detection and investigation techniques must be well-planned and standardized. These must be performed by qualified law enforcement. Investigation must take place without impeding the flow of traffic.
10. The public should be aggressively informed of sobriety checkpoints with ample warning so they can avoid them completely.
Commonly known as 'stop and identify' statutes, these laws permit police to arrest criminal suspects who refuse to identify themselves.
Currently the following states have stop and identify laws: AL, AR, CO, DE, FL, GA, IL, KS, LA, MO, MT, NE, NH, NM, NV, NY, ND, RI, UT, VT, WI