When the second born are on the beach eating popsicles, Roxana's popsicle is almost gone and when she hugs Sam you can see there is a whole popsicle in her hand.
The teens are warned that, should they fail the training, they will have their minds wipes and powers removed. At no point does it say that the Society has even considered wiping the powers of the most dangerous prisoner that they've had in custody for 10 years.
January claims that she and Edmond had been plotting their crime together but he'd been imprisoned for 10 years and she would have been five years old at that time.