Bernard, who is in a high-level position at Delos Destinations, didn't even know (or better yet, remember) that the drone hosts exist. They're unfinished-looking, white-muscled robots that perform various tasks in the facility, won't bother you if you don't bother them, and can read DNA.
In the episode, Charlotte says the drone host has read Bernard's DNA. Does that mean Bernard is a different type of host? Does it give us a hint as to what Charlotte and Delos are up to with the DNA of the park's guests?