Question on Final Fantasy 13's plot

It is unclear if the Sactum actually know that they were branded and Pulse L'cie, but according to Purge wiki, PSICOM was sent into to hunt them down regardless and apprehend them

I'm rephrasing the content from the wiki to avoid spoilers

After Lightning, Snow, Sazh, Vanille, and Hope have been turned into Pulse l'Cie, PSICOM is dispatched to hunt down them and the other Purge survivors

Actual content

After Lightning, Snow, Sazh, and Hope have been turned into Pulse l'Cie, PSICOM is dispatched to hunt down them, Vanille, and the other Purge survivors.

In the section when Snow is attack by PSICOM they locate Snow and say

L'cie spotted ..... Pusle L'cie confirmed.

We can see this in this Youtube video

This quote can be understood that they have a general idea they were L'cie, but required confirmation.