Since the Perak state assembly incident, the Police are not taking chances. Security for all Malay Rulers has been tightened. In addition to their personal bodyguards, the number of UTK officers for each istana has been increased. A Tengku Mahkota, for example, gets at least 2 more UTK tailing him whenever he's out and about. These days you don't know when some people might throw themselves in front of a Ruler's car or pelt his window with stones and middle fingers.
The Prime Minister has 6 or 7 bodyguards around him at any one time in addition to the UTK boys.
The Perak Speaker, by his own admission, has 20!
I read it at AKJ's The Scribe, here.