Aardvark154 said:
The video has "ideal situation" scenarios. For instance the video doesn*t mention that the Police Officer could detain them until the drug dog comes
Could he really? To bring the drug dog he has to DETAIN them while he waits for the dog. In order to detain he needs probable cause. That is the key behind the question, "Am I free to go?" That question forces the officer to assess whether he has legal grounds to prevent you from leaving.
At every step here the key is that you are putting the ball back in the officer's court, forcing him to assess whether he has a legal right to proceed without your consent.
In some cases, where he does have probable cause (perhaps probable cause that is unknown to you! For example you may fit the description of a suspect called out on the radio, even though you are innocent--in that case he has probable cause). If he does have it then he will proceed without your consent. Your statements in that case will not have prevented the detainment or search--but nor will they have harmed anything!
So basically it is worth saying these things simply because they MIGHT help you, and they certainly won't hurt, so it's well worth trying.
Once you've verbally asserted your rights there are then three possibilities:
1. The officer realizes he has no probable cause and stops
2. The officer realizes he has no probable cause, but does not stop, your defense attorney later will make much of this
3. The officer has probable cause and continues without your consent, legally, your statement having accomplished nothing, but also (if you're polite) no harm either.