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Please explain. How does it save time?

Quire often they will immediately glance at the one place they don't want you to search. One of those many subconscious actions people do without even realizing it.

Another thing you can do is have another officer watch the suspect while you are searching his vehicle. When an officer gets close to the contraband the suspect's demeanor will quickly change.

if a cop ever has to ask you for your consent to search, he's already pre-determined that no exceptions to the Fourth Amendment's warrant requirement will allow for a lawful warrantless search.

Not always true - quite often I will ask someone if it's OK to search their vehicle even though I've already made the decision to legally search it. I want to see what their reaction is and how they respond. Watching their response can sometimes save us lots of time.

As an owner/driver of a vehicle, you become responsible for anything inside the car as far as the police are concerned.

Not entirely true. Let's say I search your car (you have care, custody, and control of it) and you have a passenger sitting in the right front seat. While searching your car I find illegal drugs underneath the right front seat. Unless you own up and state that they are your drugs, I could charge the passenger with them depending on the totality of the circumstances.