Latest detentions raise renewed questions about safety of foreigners in China

China detained British businessman Ian Stones , five years after he first disappeared in Beijing .

He was put on trial in secret and convicted of “illegally providing intelligence” to overseas parties.

Mr. Stones ’s case has renewed concerns for the safety of foreigners in China .

China passed a sweeping new espionage law last year .

The identities of the majority of the 92 Canadians detained in China are not public, nor are those of many who are subject to exit bans.

It is unclear how much a lack of publicity in situations like Mr. Stones ’s may have led other businesspeople in China to needlessly expose themselves to risk, perhaps assuming they were safe.