In general, the police do not have the right to walk around your property without a warrant or your permission. However, there are some exceptions to this rule. For example, if the police are in "hot pursuit" of a suspect who runs onto your property, they may be allowed to enter without a warrant. Additionally, if the police believe that there is an emergency situation that requires them to enter your property, they may be allowed to do so without a warrant. Finally, if you give the police permission to enter your property, they are allowed to do so.