Stopping a vehicle based on a 911 call from a fellow motorist is illegal unless the caller exhibits reliability (e.g., provides his name and address so that he may be called to court to account for his accusations).
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Following a driver into his residence without an invitation or without enough information to justify the entry violates his Fourth Amendment rights, and is illegal.
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Satements of the driver alone, such as “I'm drunk” or “I was driving,” are not sufficient reason to arrest and charge an individual. An officer must have independent evidence to corroborate these statements. This type of error has occurred when, for example, the officer has not seen you in physical control of your car, or when no sobriety tests were performed.
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Detaining a driver longer than is reasonable to investigate is illegal. The constitution does not allow officers to hold you without limit.
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Stopping a vehicle without an articulable suspicion is illegal. A police officer can not stop you simply because he thinks you are suspicious; the officer must be able to cite a specific behavior on your part which aroused his suspicion
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Stopping a vehicle simply because it is traveling too slowly is not legal. There must be a traffic violation of or other articulable reason to detain the operator.
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Weaving within a lane of traffic is not illegal.
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Weaving out side of a lane of traffic is not illegal unless unsafe to do so. A person must traveling as nearly as practicable within a single lane of traffic. Some cases hold that multiple weaves into a shoulder is not sufficient case to detain an individual.
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Stopping a vehicle based on a misperceived violation of a law. The officer must be right about his interpretation of the law.
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Stopping a vehicle for an improperly placed traffic control device or marked lane of traffic. Street signs and lane markings must comply with the Manual for Uniform Traffic Control Devices.
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Failing to follow the rules of the Department of Public Safety Breath Testing Manual. Failure to follow these rules may invalidate any alcohol testing.
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Stopping a vehicle at an improperly staged roadblock.
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Stopping a vehicle to check the driver’s license and registration. There must be an actual traffic violation or an articulable suspicion of a crime.
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Stopping a vehicle without being able to identify it as the one actually committing a traffic infraction. Officers must be able to convince the Court that they stopped the right car.
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Blocking a vehicle’s exit without justification. Officers may not restrict a driver’s freedom to leave without a reason.
