The law prohibits criticism of the Sultan and government in any form or medium. Oman's police do not need search warrants to enter people's homes. The law does not provide citizens with the right to change their government. The Sultan retains ultimate authority on all foreign and domestic issues. Government officials are not subject to financial disclosure laws. Libel laws and concerns for national security have been used to suppress criticism of government figures and politically objectionable views. Publication of books is limited and the government restricts their importation and distribution, as with other media products.