The Egyptian plane crash:-

http://news.sky.com/story/1605434/egypt-russian-jet-not-downed-by-terrorists

I said from the outset that if there'd been a bomb as the cause there would be signs of that on the wreckage and traces of explosive. What's the hold up?

In a crash involving a mid-air break-up, the debris trail usually indicates which bits came off first so any explosive residue ought to have been found somewhere near the site of the "breaks" causing the first bits to come off?

As the plane was approaching cruising altitude and speed, the rest of the plane would continue therefore strewing the debris field quite a way further on from the first bits to fall so what's been preventing the usual crash investigation procedure?