What it means to a programmer is that, if you're involved with a project that has serious implications (in this case, evidence can result in a conviction and jail time), you had better do it right. And that's because your work can be gone over with a fine-toothed comb by a defense team. And for something so serious, it darn well had better be able to stand up to inspection.
Even better, it's not a difficult stretch at all to see how this sort of a ruling might be expanded to other things, such as ATM's - and even voting machines. No matter what side of the political spectrum you're on, I'm sure you want elections to be as fair as possible. I know I do.
This ruling only applies in Florida for now, but I don't see any reason why it won't be extended. So make sure you ship good code, if it's for something important.