Louisiana Revised Statutes Tit. 32, § 295.4. Guidelines for seat belt, motor vehicle inspection, and motor vehicle liability security checkpoints;  law enforcement agencies

(1) The location, time, and duration for seat belt, motor vehicle inspection, or compulsory motor vehicle liability security checkpoints shall be established in written form by supervisory or other administrative personnel of the law enforcement agency rather than the field officers implementing the checkpoint.

(2) For purposes of motor vehicle inspections, the location of the checkpoint shall not be less than five hundred feet from an intersection between a state and federal highway.

(3) Provision for advance warning to the approaching motorists with signs, flares, and other indications to warn motorists of an impending stop and to provide indication of its official nature as a police checkpoint.

(4) Provisions to ensure detention of motorists for a minimal length of time.

(5) The use of systematic, nonrandom criteria for stopping motorists.

(6) Provisions prohibiting the establishment of checkpoints where the only vehicles subject to or targeted for inspection are motorcycles, as defined in R.S. 32:1.