Once you are caught for espionage or carrying out any activities
a country defined as contravening national security, don't think
there is much you can do and you can't trust any government, not
the communist nor the american, not even singapore with its ISA,
any human right standard or other moral standard. You can only hope
that your own country is on your side to fight for a fair trial if
not for release. Can you trust your own country? Is Ching a
singaporean or a hongkonger?
Is this a case of espionage or free journalism?
Is he one of the "Straits Times intel officers"? sent to "shed
blood to overthrow the communists"??? 
Or was he making some extra for his retirement? (Latest news he was
working for the taiwanese.)
Or was he just doing his job as a true journalist trying to unveil
the secrets behind the iron curtain and crossed the
boundaries?
don't think ST or Temasek Holdings would risk all their interests
in china for one person.
Will he become a martyr of freedom or is he simply made a
scapegoat, or was he set up?
The only thing we can do for Ching is to pray for him.
Just have to remember, when entering countries like indonesia,
malaysia and singapore, don't bring in anything that is defined as
drugs; when entering countries like america, don't walk around with
a parcel or a luggage, which would be defined as possible explosive
device; when entering communists countries like china and vietnam,
know what could be defined as "sensitive or possible subsersive
documents." I always make sure that I dump all the taiwanese
newspaper even before I land in Hong Kong.