If they are bringing in government employees to act as police (vs security)for the event, I guess a question is, "Is that okie dokie?" The WEF is a .org, not a .gov.
If, say, the Sun Valley Conference (kind of a US version of the WEF conference) got state police to patrol the conference instead of private security and gave them identifying patches to wear on their government uniforms, yet they still had the full resources of the state police, as well as ability to arrest, is that cool?