Yes, the Justices do have their own SS force. Scalia had a such a force. This past week he was in Dallas speaking. After doing so he walked out and with the force in tow proceeded to a nearby barber shop. Had his hair trimmed and chatted with the barber. Said he was hungry and where was a good place to eat. Barber told him around the corner. Scalia asked to barber if he would care to grab a bit with him. The two had lunch together at a small cafe. One presumes the force was seated at near by tables. If, indeed, the man was poisoned, that barber might have in his position a lock to examine at some point in the future? This adventure was told on live local radio last week. It is presumed the source is reliable. DH heard the broadcast and relayed the info. At the time it seemed rather strange and off the wall. But it also showed just what type of man A. S. was. A man of the people.
I read where the justices are protected by US Marshals.
So if they do have a SS force, they must have a protocol to investigate people that are DOA on their watch. Plus, dont these high profile people get CAT scans of heart arteries? Stents are very cheap and it would seem he would have been screened.