State regulators acknowledge they still have not done any testing after environmental groups alleged last month that an Eastern Shore chicken farm was polluting a Chesapeake Bay tributary. The state says the owner of the farm near Berlin has refused to allow inspectors to take samples from a pile of sewage sludge or the water in a drainage ditch. The state says it will pursue a search warrant if the owner does not comply. The farm raises chickens for the Salisbury-based poultry company Perdue Farms.