Humberside Police said the pilot will now be extended to include North Lincolnshire. Spit guards are placed over the heads of suspects to prevent spitting or biting. They can only be used once and are usually used in custody suites or when moving …Humberside Police to extend ‘spit hood’ pilotYorkshire PostSpit guard trial extended to officers in police cellsHull Daily MailSpit guards will be piloted across Grimsby area after successful police trialGrimsby Telegraphall 5 news articles »