[IChing]

They said it was being “sent for tests” which somewhat limits the types of things it could be...

[bonfire]

Drugs?

[spokeshave]

They said it was being “sent for tests” which somewhat limits the types of things it could be...

My guess is that it's his home computer/laptop/smart phone

[lulu16]

Here’s another thread

http://www.freerepublic.com/focus/f-bloggers/3272553/posts

with links to a Christian site that is supposing he was radicalized.

http://romancatholicimperialist.blogspot.co.il/2015/03/muslim-convert-co-pilot-andreas-gunter.html

[Born to Conserve]

“...They said it was being “sent for tests” which somewhat limits the types of things it could be......”

These days, everything gets tested — for DNA, fingerprints, etc.