British investigator Peter Humphrey and his wife Yingzeng Yu were indicted for allegedly obtaining and selling information illegally.
Humphrey and his wife were arrested in 2013 following work they did for GlaxoSmithKline
GSK confirmed the existence of the tape on 29 June but did not disclose details.
Orphans at homes where graves uncovered were used to test diphtheria vaccine.
GSK was accused of mis-promoting asthma medication Advair and anti-depressants Paxil and Wellbutrin.
UK's largest pharmaceuticals firm, GlaxoSmithKline, subject to probe of "commercial practices".
Drugmakers' profits and margins decline in China due to crackdown on corruption and price cuts.
Briton Mark Reilly and China's Zhang Guowei and Zhao Hongyan were charged with corruption in May
China charged former boss of GSK's China unit, Mark Reilly, and two other executives with corruption
Two Chinese executives, Zhang Guowei and Zhao Hongyan, are also suspected of bribing officials.
China accuses GSK executives of routing 3bn yuan in bribes to doctors through travel agencies and consultancies
GSK shares fell after Britain's biggest drug maker also showed 10% drop in first quarter sales
GSK executives in China are already under investigation for routing 3bn yuan in bribes through agencies
Doctors are accused of routing 3bn yuan in bribes to doctors through travel agencies and consultancies
Investors await GlaxoSmithKline Q4 earnings update due at 12.00 GMT.
The US Fed's FOMC will meet on 17-18 December.
US Federal Reserve's FOMC will meet on 17-18 December.
Move indicates that GSK is more reliant on high-growth emerging markets than traditional western markets.
Britain's "Patent Box" tax breaks motivate GSK to invest more in UK.
The pharmaceutical giant GSK's move will create 25 new jobs in Montrose.
Reports say the company and Briton Mark Reilly, GSK's former head of China operations, will escape charges
Ernst & Young report reveals Asia has the worst defences against corporate fraud of any region.