How worried should we be about match-fixing in football?
The problem I have with match-fixing in football is wondering how worried to be about it.
On the one hand, the head of the investigation being carried out in Germany, commissioner Friedhelm Alhans, painted a depressing picture, with 300 suspicious games under scrutiny in an investigation that's seen 70 people arrested in Turkey, more than 20 in Croatia, and everything from international friendlies, a Champions League and some Europa Cup games, to lower league semi-pro matches under examination.
He says it's the "tip of the iceberg". Working on the literal principle, that means it's about 10 times worse than they already know about.
Yet, when Interpol's general secretary Ronald K Noble was pressed on the issue of how worried we should be, he sought to reassure, at least in part, saying he felt the major European leagues were clean, that spectators should have confidence. Asked specifically about our domestic leagues, he suggested there were no issues.
The messages remain mixed, however. Noble also spelled out how the fixers operate.
"Nothing new in it," he said. Find the weak and vulnerable, tempt them with enough money, and manipulate them, using violence if necessary. He managed to make the chilling reality sound as everyday as popping out for a pint of milk.
Everyone is in agreement that this is the work of organised criminal gangs. They fix matches, they traffic performance-enhancing drugs and deliberately target the $300bn (£183bn) worldwide sporting industry, because just a small slice of that is a fortune.
Much of the focus of the gangs, and now the football authorities, appears to be referees, especially where they are not fully professional. The money they make from 90 minutes with a whistle in their teeth is often a pittance compared with those they seek to stay in control of.
Fifa president Sepp Blatter spoke of the need for all referees to be professional, but even if you paid those in the top leagues £250,000 a year, they'd still be relative paupers compared to the players. Envy? Greed? Easy money? Those are the traits that the unscrupulous exploit.
Interpol's man made it clear the match fixers are working their angles because it's low risk - hardly any have ever been caught and the rewards are great. The International Olympic Committee (IOC) suggested perhaps well in excess of $100bn of the $300-$400bn sports betting industry is going on illegally, unregulated, invisible.
The 20m euros (£17m) Fifa has pledged to Interpol over the next 10 years to create its own football anti-corruption training wing at the police organisation's HQ in Singapore represents the largest single investment it has received from a private organisation, but it's a drop in the ocean to the criminals.
The German police reported they are sure that 1.7m euros (£1.5m) had been paid in bribes to third parties in the cases they're still investigating, and they seem sure there's much more going on we don't know about.
The criminals have the working capital, motive and opportunity they need. Yet the football authorities still managed last February to fail to ensure that two international games played between four different counties on the soil of a fifth were free from manipulation.
The games were set up by an agent that no-one seemed to check out, refereed by officials whose identity was unknown until just before kick-off, and even then disputed.
Several employed by the football associations involved said afterwards they thought the arrangements were a bit odd, yet failed to act.
Fifa now say they have a series of reforms to put to congress next month to tighten up their regulations, but as so often is the case, they are locking the stable door after the horse has bolted.
So how worried should we be? You decide......