It was reasonable to detain the defendant for a total of 45 minutes after the initial traffic stop while waiting for a drug dog to arrive to search the defendant's car. The initial investigative detention was reasonable because the officer had acquired articulable facts that, when combined with rational inferences from those facts, led him to reasonably believe that the defendant was actually engaged in criminal activity. Also, the 20-minute detention after the defendant denied consent to search his vehicle was reasonable because the officer diligently pursued a means of investigation that was likely to quickly dispel or confirm his suspicions by immediately attempting to locate a drug dog. Love v. State, 06-07-00147-CR [1].