His theory is he attended a public meeting on anti-spying related to Snowden and tweeted about it:
At RIBA with @imogencrispe to continue the conversation about mass surveillance #debatestartshere #stopbuggingus pic.twitter.com/YcTEWG6taC— Sam Blackman (@srossblack) November 4, 2013
NZ Customs say that's not it:
"However, the Customs spokeswoman denied that was the case. "I can confirm that Mr Blackman's electronic equipment was detained in relation to suspicion of objectionable material," the spokeswoman said."
His journalist girlfriend also tweeted this from the same public meeting:
Rusbridger: Docs show close relationship of #GCHQ and #NSA, can't tell where one stops and the other begins #stopbuggingus #masssurveillance— Imogen (@imogencrispe) November 4, 2013
An idiot could take this to mean that she had been in contact with or been given the documents. This would not be the first instance (internationally) of a journalist's partner being detained by customs in relation to the Snowden case.
So the question is: Would the possibility of Snowden's documents being present be included in the definition of 'suspicion of objectionable material'?