At what point do you think the officer had enough evidence to lawfully detain the suspect?

Part I – Please define and describe the following legal concepts:
Reasonable Suspicion
Probable Cause
Proof Beyond a Reasonable Doubt
Part II – Please explain which of these concepts requires the most amount of evidence and which requires the least amount of evidence.
Part III – Please explain how each of these terms relates to a particular stage in the criminal justice system (e.g., detention, arrest, conviction).
Part IV – Please watch the video in the hyperlink below and answer the following questions:
PLEASE NOTE: FOR THIS PART OF THE ASSIGNMENT (PART IV), I DO NOT EXPECT YOU TO GIVE THE LEGALLY CORRECT ANSWER; I DO EXPECT YOU TO APPLY WHAT YOU’VE LEARNED IN THIS PART OF THE COURSE TO EXPLAIN YOUR ANSWER AND WHY YOU THINK IT IS CORRECT.
At what point do you think the officer had enough evidence to lawfully detain the suspect?
At what point do you think the officer had enough evidence to arrest the suspect?
Do you think the video recording of the suspect and the testimony of the officer is sufficient evidence to convict the suspect for the crime of being in possession of a controlled substance? What about the crime of being under the influence of a controlled substance?