unconfined_t

[Ma. Alejandra Castillo]

Dear all, 
 i have a question for you, when i execute the comand id -Z for example:
 id -Z for the users root i obtain this output root:system_r:unconfined_t
id -Z for the user mai user_u:system_r:unconfined_t
 and the same happens with all the users that i have created.
 why does it appear as unconfined_t??
how can y change this?
  Saludos