A Miami Police officer was arrested at gunpoint and charged with reckless driving after allegedly leading the Florida Highway Patrol on a seven-minute chase in his squad car at speeds that reached 120 mph on Florida's Turnpike in Broward County earlier this month. A highway patrol trooper pulled out her gun to arrest Fausto López, 35, after he reportedly ignored repeated warnings to stop. 

The arresting officer is a State Police officer and the guy arrested is a city Police officer.

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Interesting.
I'm going to move this to Crime section. Should get the appropriate attention there.

Of course yes.

Pukkah:

Of course yes.

You seem so certain? Wouldn't the issue of rank and the fact that they're both armed come into play? Can you imagine a junior MOPOL trying to arrest a senior officer? The police cannot even arrest military men even though they have completely different jurisdictions!

the cop was off duty on his way to his second job in city property. recently a cop car was stolen and the robber killed so the state trooper was in tuned with current events.

Wallie:

You seem so certain? Wouldn't the issue of rank and the fact that they're both armed come into play? Can you imagine a junior MOPOL trying to arrest a senior officer? The police cannot even arrest military men even though they have completely different jurisdictions!

A police officer can arrest anybody that he thinks has committed a crime provided he can disarm the suspect. A senior officer may not even be able to arrest an armed junior officer if does not lay down his arms.

The loyalty of an officer is not to another officer, it is to the state. It may be difficult to practice but that's it.

Well . . . it would only fly in a situation where all parties have regard for the rule of law.
Remember the Denzel Washington movie, The Siege? FBI officers were trying to arrest an Army General in a New York that was under martial law. All while they were surrounded by soldiers with combat gear and small arms. All with service issue pistols. In a real life scenario, that would definitely have turned out differently

It is a complicated matter with Military Officials exempted from multiple jurisdictions of security agencies regardless of any country except for those who do not have any set of laws defined or where the military does not exist.

NO, Police cannot arrest the Military Officer anywhere in the world unless directed so by the Military itself or the Federal Government asking for an arrest. Even in those cases there is a methodology involved. Uniformed officials after they have recognized themselves to the agency (Police, FBI, CIA) cannot be arrested at gunpoint (there is no question at all) as all uniformed military officials are members of Federal Government not State or Provincial Governments, indeed it is a serious breach of law pointing a gun onto a uniformed military official as they are entitled to self defense where-ever what-ever the situations or consequences are.

But does that mean they cannot be charged for a crime? NO, they can be but to that even an appropriate method is in place. Police official will request the Officer to Comply and Co-operate with them in petty crimes (If they do not comply without recognizing themselves they are treated as civilians, if they have recognized themselves and still do not comply their identity itself is enough to levy a charge against them as it is military not a private organization where employee will runaway or vanish; he has to report to the command when required, thus police prepares a case against the officer and forwards it to their respective command where a court of inquiry (CI) is put in place to greet him the moment he reports back) and a report is initiated that is not dealt by the civilian authorities (civil courts) but are rather forwarded to their respective Command/Units/Regiment for consideration of awarding a penalty. There the Military Courts called usually Judge Advocate General Branch (JAG) of military decrees a penalty against an officer thus no civilian court can try a military uniformed officer. That is in case of petty crimes. (Officers are not kept behind bars as it is been depicted here but rather they are treated with utmost respect and their respective command is informed about it who assign the task to Military Police to procure the officer back to base with details of charges levied against him)

In cases of National Security or where the Case is of a serious nature then federal government asks the military to exempt a particular individual from Army Act and even then the state agencies cannot take the matters into their hand rather Military Intelligence Coupled with CIA or FBI retrieves the individual and if he does not comply he is taken by force a warrant issued not by the Civilian Court but by the Military Courts based on which he is taken into custody.
Case # 1 The concerned officer is not directly presented to civilian courts but is initially presented to military court which on accounts of National Security or a serious breach of law rather exempts him from Army act to be presented to Civilian Court (the official remain under the legal custody of military and JAG Branch representatives are present there in the hearings) if the officer is proved to be guilty the military courts then decree a penalty against him that is usually a court-martial from the military and military imprisonment after which the individual has to face the civilian court again who decree a penalty onto the officer of its own. (i.e if individual on killing another citizen has been confined to military imprisonment for 10 years after which he is released the civilian court decrees a penalty of 15 years then the officer serves another 5 years in prison accounting his military imprisonment of 10 years as penalty is federal not stratified to subjects of federal government i.e Military, Judiciary etc.)
Case # 2 is fairly simple in which if required by the civilian courts for a heinous crime of a civilian nature military Court-Martial the officer after which he is not under the domain of Military law (Armed Forces Act.) rather he is a civilian and faces a criminal penalty of civilian in nature.

Yes I can happen, and it happens a lot in South Africa, offices suspected of corruption and other crimes do get arrested by other officers in uniform, and a lot of these arrests happen while the suspect is on duty

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In so far as it is a criminal offence, yes, he can be arrested. For those saying otherwise, in Nigeria not long ago, a policeman was arrested (while he was on duty & @ a gun point) for murder he committed a week before. I know the case v.well because I attended the sitting.