BISMARCK, N.D. (AP) — Agriculture Commissioner Doug Goehring is cautioning North Dakota farmers about the possibility of people impersonating state employees in order to take photos and samples of grain.

Goehring says his office has had calls from farmers about people supposedly acting in an official capacity and taking photos and samples of wheat fields.

He says no state government agency or North Dakota State University has authorized any such work. And he says anyone working for the state should be able to provide proper credentials and the reason for their visit.

Goehring encourages farmers who encounter suspicious activity to alert the authorities.