From your previous posts you seem to say that if I am driving my car, minding my own business, that the police can pull me over and search my vehicle just because I look suspicious. If this is what you believe then you are greatly mistaken. My point is that the police cannot stop and search based on suspicion alone there must be probable cause, which as stated by others is different than reasonable suspicion.
You keep on believing that. And try to get your terminology straight.
The term is probable cause, not reasonable cause. You are confusing reasonable suspicion, and probable cause.
Reasonable suspicion is adequate for making a stop, detaining an individual, or searching a vehicle, to include an aircraft. Reasonable suspicion isn't simply a hunch. An officer who can articulate reasons for the stop and show that another reasonable officer would conclude the same suspicions, will nearly invariably be upheld in his use of reasonable suspicion.
Subsequent to the stop and search, additional probable cause will be attached when evidence is located or supporting circumstances can be shown to indicate probable cause.
PC for stopping your car may be as simple as a headlight or taillight out. It may be the way you're driving the speed limit when everyone else is doing ten over. It may be that you're in a place where you shouldn't be. It may be that you're acting suspiciously. It may be the mud on your fender in a location where there's little mud. It may be you driving with your windows rolled up when everyone has them down, or with your windows down when everyone else has them up in the winter.
Many of those items by themselves don't indicate probable cause (save for the violations cited first; the headlight and tail light out), but may be factors in reasonable suspicion when considering the big picture. It may include the way you don't make eye contact with an officer, or the nervous glance you make back at your trunk, or the way you suddenly speed up, turn away, or slow down. It may be the fact that your kids knees look too high in the minivan...indicating something is hidden on the floor. It may be a number of factors which, when combined, create reasonable suspicion.
Most definitely reasonable suspicion can be grounds for a search or detention, and no, a stop based on reasonable suspicion is NOT prohibited by the fourth ammendment.
To conduct a "Terry" search, an officer does not need probable cause. Reasonable suspicion is adequate, and this simply means that a combination of the facts of circumstance, or appearances thereof, would reasonably lead that officer to conclude that the suspected person is guilty of imminent, or past illegal activity.
If you're located in an area where you're subject to search as a term or condition of entry (the case in many airports), then you grant permission to be searched by entering into the premisis. Ever see a sign that states something along the lines of "Persons or property are subject to search?" That's your warning that you'll be subject to search if you enter. Your entry is implied permission; you've given your authorization to search by entering. Neither reasonable suspicion nor probable cause is necessary from that point, as you've already granted authorization.
Now, if you think you can give the US Constitution a quick reading and know and understand the law, you're grossly mistaken. The application of the law goes far beyond the simple wording in the constitution. Your assertion that you don't need case law is quite ignorant and naive, as it's the courts which render interpretations of constitutional rights and the applications thereof. Most certainly case law is applicable.
In Ornelas v. United States, the Court stated:
This is in response to your request for a brief description of the Fourth Amendment's probable cause, reasonable suspicion, and reasonableness standards. In over simplified terms, probable cause "exist where the known facts and circumstances are sufficient to warrant a man of reasonable prudence in the belief that contraband or evidence of a crime will be found,......Under a similar gloss, reasonable suspicion is a standard, more than a hunch but considerably below preponderance of the evidence, which justifies an officer's investigative stop of an individual upon the articulable and particularized belief that criminal activity is afoot,...
While the seizure itself or arrest which might follow a stop for reasonable suspicion can't be based soley on the suspicion, it's really quite irrelevant to you. If you're carrying illegal weapons in your car or airplane and are stopped and searched, you won't really care whether it's the probable cause statement attached to your arrest report which supports the case against you, or if it was merely reasonable suspicion that started the process off. The result for you is the same.
Of course, you've failed to address or contribute, as has stupidpilot, the topic of carrying a firearm as a crewmember under Part 135...which, after all, is the topic of this thread.