Here we go again. The Special Tribunal for Lebanon, a United Nations-backed body investigating the killing of Lebanese Prime Minister Rafiq Hariri in 2005, has accused four people of his murder. They all belong to Hezbollah, the militant Lebanese Shiite movement that Israel and the United States define as terrorist. But they are probably not guilty.

Special tribunals of this sort have no intelligence agents of their own. In practice, they rely heavily on information supplied to them by national intelligence services that they trust. But they are judges, lawyers and other unworldly types, and they don't seem to understand that there is no such thing as a trustworthy intelligence service.

Immediately after the explosion that killed Rafiq Hariri and 22 other people in Beirut in 2005, Western and Israeli intelligence services said that the Syrian government was behind it, and that the Iranians were behind them. Well, of course. The main aim of the U.S. and Israel at that time was to get Syrian troops out of Lebanon, where they had been stationed since shortly after the start of the Lebanese civil war in 1975.