What is the current state of the law on "consensual encounters" with the police?

"For purposes of Fourth Amendment analysis, there are basically three different categories or levels of police 'contacts' or 'interactions' with individuals, ranging from the least to the most intrusive. First, there are . . . 'consensual encounters' [citation], which are those police-individual interactions which result in no restraint of an individual's liberty whatsoeveri.e., no 'seizure,' however minimaland which may properly be initiated by police officers even if they lack any 'objective justification.' [Citation.] Second, there are . . . 'detentions,' seizures of an individual which are strictly limited in duration, scope and purpose, and which may be undertaken by the police 'if there is an articulable suspicion that a person has committed or is about to commit a crime.' [Citation.] Third, and finally, there are those seizures of an individual which exceed the permissible limits of a detention, seizures which include formal arrests and restraints on an individual's liberty which are comparable to an arrest, and which are constitutionally permissible only if the police have probable cause to arrest the individual for a crime." (Wilson v. Superior Court (1983) 34 Cal.3d 777, 784.)