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It will depend to an extent whether the tip is compelling, corroborated and credible. However, assuming it was something as basic as "Mr. X has open alcohol in his vehicle", that should not provide lawful grounds for the police to pull over and search X's vehicle with no warrant or consent from X. If it is an unjustified warrantless search, then it would likely be unreasonable and thus in violation of X's Section 8 Charter right to be secure against unreasonable search & seizure, so X may be able to get any evidence found as a result ruled inadmissible at trial, and if such is the case, the crown may drop any charges laid.
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