In the same breath that says that these "sovereign citizens" (whatever that is) are fraudulently/illegally taking over foreclosed homes, the FBI is saying that there was no illegal act that took place, so the "sovereign citizens" cannot be arrested as "no threats were made."
Adverse Possession without Color of Title is a right that anyone has to take over an abandoned home and live there legally. All the couple would need to do is pay the property taxes and pay for the upkeep of the home (such as utilities and lawn maintenance) which is what would be done if the home was occupied in a non-adverse way. Notice that the article does not say anything about Adverse Possesion or squatters rights, legal processes of occupying properties that have been abandoned, but instead moves to slander the couple, making it seem as if they are acting fraudulently.
The people who occupied this property did make a mistake in choosing a bank owned home for Adverse Possession. They should not seek out bank owned properties as they can reset the time needed for Adverse Possession quickly, reducing the amount of time that this law needs to take affect.
The article also states (in a passing sort of mention) that the couple had went to court to argue the validity of their claim on the property, so they were not directly evicted. This is a natural process in Adverse Possession, for the owner to try to get the home back. The home did not seem to be abandoned, which probably worked against the couple in a major way. The couple did not move into the home and then were immediately thrown out - notice how the word "evicted" was used and not "thrown out". This is a very important thing to note.
Read the article for yourself. :)
"http://www.cnn.com/2011/US/03/08/georgia.sovereign.citizens/"