You… Arrest Starlight Glimmer?  
Hmhmhmhm…  
So why don’t you?  
That is, if you can?

@redweasel  
Again, they didn’t let her go so much as they failed to capture her. Intent.
 
 
@Twilight_Shimmer  
…And would “identity theft” be too punny?

That would probably be the realistic ending.

oh hey wow it’s great to be back in ponyville la la la oh hi princess celestia!  
and how have you been my little ponies?  
we found a unicorn mare with tirek’s powers!  
where is she?  
we have no idea! we let her go!  
what

@Scrounge  
Ohh good idea! :)

I think she could also be charged with kidnapping and resisting arrest.
 
@DasHiveMind  
And they were never going to follow her again, so what good would taking their cutie marks do other than weakening them? Where would she even keep their cutie marks if she took them? She couldn’t use these ponies any more, and she has no conscience, so why wouldn’t she kill them?
 
 
@Twilight_Shimmer  
Tartarus, perhaps?
 
Certainly not the human world, even without magic she’d be too dangerous for its people. Especially if she tried to pursue her agenda again via mundane means, such as mind-altering chemcicals.
 
Perhaps if somepony else were to learn how she does her little trick, she could be given a truly fitting punishment: The confiscation of her own cutie mark, separating her from the things which make her such a menace.

@drumpowa  
Good point. Let us call in Discord and Shining Armor to assist, it should make things interesting. :)

@Twilight_Shimmer  
Well before we start doing some wishful thinking of how to process her into the system, the arraignment and so on and so forth, we actually gotta catch the bitch.
 

 
We’re on a marehunt.

@fixman88  
That she does, now the question is where will she be banished to? The Moon? The Sun? Or will she simply be turned into stone for a few hundred years. :)

Wow, she has quite the list of violations, doesn’t she?

@pegasusexpress2010  
Well, the American definition of treason is very limited. It’s defined by the Constitution to only include two things: waging war on the U.S. and giving material aid to its declared enemies. Most monarchies, on the other hand, also consider the attempted murder of the head of state to be treason, and a number of them include lesser crimes as well. (True story: four Swedish teenagers were convicted of treason in 2001 for throwing a cake at the king. They were fined $370 for it.)

I would LOVE for a marehunt episode.

@pegasusexpress2010  
Hmm i suppose thats a good point. Either way when shes caught shes going to be in a LOT of trouble XD

@Twilight_Shimmer  

 
It does have “assault on a head of state”. I’ve never seen the FBI use “treason” in a wanted poster, either that or an unfortunate oversight.

@Background Pony #3C58
 
Not really much different from the sound effect when the unmarking spell was first cast.

@Jarkes  
Also even if we assume it was another cutie mark removal spell (unlikely but arguable) it was only luck the ponies giving chase didn’t fall to their deaths into the chasm when Starlight broked the bridge.

@Background Pony #E18F  
Didn’t it have a Dalek/laser sound effect? So it was deadly.

Treason could be added to that list of crimes. As she DID attack a Princess

@Background Pony #5C38  
@Jarkes
 
I had assumed that spell was meant to remove their cutie marks.

Lotta good points and examples no?

@Twilight_Shimmer
 
@PonyPon
 
@Jarkes
 
@Background Pony #5C38  
Okay, okay, I get it now! X3

@Joshua  
The spell that Starlight aimed at the 4 ponies before Twilight blocked it. It seemed like a pretty powerful laser spell meant to kill.

@Joshua
 
It was pretty clear that she intended to kill the ponies in the mountains after they got the mane six’s cutie marks back.

@Joshua  
The last blast near the end that Twi blocked.

@Joshua  
well she DID magically attack twilight