So Casey lies and says she saw the child just yesterday. That’s all this law will accomplish. Anyone with any common sense knows Casey killed her own child. She told lies to cover it up. So another lie isn’t going to be much of a hurdle to circumvent this new law.
There might be a few people stupid enough to think, “Whoops, I just killed Tom! I’d better call the police and report him ‘missing’ so I don’t risk a fine for failing to report it!”