[p_j_w]

I worked for a government lab some time ago, and FOUO wasn't used to shield against FOIA. Indeed, OUO documents can be released to a FOIA request. It was more or less just the default because no one wants to get in trouble for not making things that are supposed to be marked.

[HanShotFirst]

What I've seen used as a shield against FOIA is the label, "DRAFT - For Discussion Purposes Only." This is meant to ivoke the "deliberative process" exemption.

[soheil]

  -draft