This is what is called “formalization”, meaning, there are merits to detain and investigate him, plus they want to prevent he can escape while doing so. He is still non-guilty, until proven otherwise, but the public always see this as guilty.
There is still a lot to dig to find if they had a million dollars in the first place at all. Someone approve that sell, and if they had it, someone took it and probably left the country for good.
It feels very implausible Jadue didn’t know what was happening, but who knows if someone (or a couple of guys) decided to play cards below the table for that amount of money. Anything could have happened.