inspection
sticker.  When asked where he was coming from, Tucker responded "El Paso."  He
allegedly rented a car in or around Lubbock, drove it to El Paso, left it at a rental car
agency at the El Paso International Airport, and was returning to Brownfield via the car in
which Johnson stopped him.  Apparently, appellant followed Tucker to El Paso in that car. 
	After conversing with Tucker momentarily, Johnson left him standing alone, returned
to Tucker's vehicle, and proceeded to ask appellant for identification.  During this
conversation, appellant was "extremely nervous," breathed in rapid, shallow breaths, and
evasively answered Johnson's questions.  Furthermore, appellant indicated that the
address on his driver's license was not current. (2) 
	Johnson returned to his squad car to report the stop, solicit information about the
existence of outstandingwarrants on either of the detainees, and request backup.  He
decided to seek backup upon realizing that Tucker was the brother of a good
acquaintance.  This acquaintance had told the officer that Tucker was "heavy" into drugs
and that he (Tucker) had been threatened with bodily harm by someone in El Paso over
a drug matter.  Eventually, the police dispatcher responded to Johnson's solicitation and
informed him that either Tucker or appellant had been twice arrested for narcotics
violations. (3) 
	Subsequently, Johnson left his vehicle, approached Tucker, explained the traffic
citations he proposed to issue him, and asked if Tucker's car contained any contraband
of any type.  Tucker responded in the negative.  The officer then asked for permission to
search the vehicle.  Tucker said no.  Johnson then proceeded to Tucker's