 A dispersal declaration remains in force for not more than 48 hours, but this is without prejudice to the making of a further declaration.A police officer not below the rank of sergeant may, without warrant and with or without assistance, enter and search any premises, stop and search any vehicle or individual, whether in a public place or not, if he suspects that any evidence of the commission of an offence is likely to be found on the premises or individual or in the vehicle, and may seize any evidence so found.In addition, any police officer may, when on duty and on the authority of a police officer not below the rank of sergeant, stop, board and search any vessel not being or having the status of a ship of war, and remain on board so long as the vessel remains within the waters of Singapore.