Explosive Trace Detection
Are there any Explosives (Bomb materials) that don't naturally leave a chemical/forensic trace?
What's the trace of a lithium ion based explosive (mobile phone device) inside a compact non-security screened food container.
Lastly is there any worldwide cases of ETD methods being difficult to find traces and relying on other sources to conclude?
I mention this as surely there was evidence of this on other events, and they aren't assuming all this based on Military satellite.