In multiple recent threads, mainly involving discussion of whether you're required to identify yourself to a LEO but also in other topics, I've seen the phrase "probable cause" used in a context that suggests a fundamental lack of understanding of this and other similar terms on the part of the person using it.
I'm neither a lawyer nor legal expert, but I have completed some training/instruction on these topics and, using simple Google search, have found these links that may prove helpful to a better understanding of current differentiation between various police contacts and the level of information necessary for police to legally take certain actions.
In a nutshell:
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probable cause is sufficient for arrest, search, and seizure;
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reasonable suspicion is sufficient for temporary detention, formal investigation, pat down/frisk etc
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mere suspicion or a "hunch" is sufficient for a consensual or voluntary contact
http://www.policemag.com/channel/patrol ... top-view=1" onclick="window.open(this.href);return false;
http://www.policechiefmagazine.org/maga ... e_id=42007" onclick="window.open(this.href);return false;
Also as specifically related to Texas law about identifying yourself to LEO:
PC 38.02 -
http://www.statutes.legis.state.tx.us/D ... .htm#38.02" onclick="window.open(this.href);return false;
GC 411.205 -
http://www.statutes.legis.state.tx.us/D ... tm#411.205" onclick="window.open(this.href);return false;