A British multinational being paid $1.2 billion to implement Obamacare’s federal insurance exchanges is under investigation after allegedly overcharging the British government by tens of millions of dollars.

Reuters reports that Britain’s Serious Fraud Office is now looking into Serco, a massive service and security firm employing 120,000 worldwide, after the company reportedly overbilled its government client as much as $80 million for criminal electronic monitoring devices.

Around one in six of the criminals listed were already in prison, had left the country, were not required to wear a device, or were even dead.