Arrest warrants are serviceable anywhere, and if someone is arrested on a warrant from another jurisdiction, it's usually because the defendant was detained initially for some other reason, like a traffic ticket. My guess is that the arrest warrant, issued by LA County, is seeking to have neighboring jurisdictions and states play a more active role in apprehending him. The requirement about holding him without bail is superfluous if he is apprehended out of state as he would automatically have a detainer placed on him until extradition.

I don't think any jurisdiction would entertain a thought of imposing bail, which takes into account the risk of flight and safety to the public. Dorner scores big zeros on those factors, but the DA and LAPD are desperate and frightened.