The situation with vouchers in Louisiana is obviously quite complicated, and there are strong opinions on both sides of the issue, but I’d like to comment quickly on the new “accountability” provision. It's a great example of how, too often, people focus on the concept of accountability and ignore how it is actually implemented in policy.
Quick and dirty background: Louisiana will be allowing students to receive vouchers (tuition to attend private schools) if their public schools are sufficiently low-performing, according to their "school performance score" (SPS). As discussed here, the SPS is based primarily on how highly students score, rather than whether they’re making progress, and thus tells you relatively little about the actual effectiveness of schools per se. For instance, the vouchers will be awarded mostly to schools serving larger proportions of disadvantaged students, even if many of those schools are compelling large gains (though such progress cannot be assessed adequately using year-to-year changes in the SPS, which, due in part to its reliance on cross-sectional proficiency rates, are extremely volatile).
Now, here's where things get really messy: In an attempt to demonstrate that they are holding the voucher-accepting private schools accountable, Louisiana officials have decided that they will make these private schools ineligible for the program if their performance is too low (after at least two years of participation in the program). That might be a good idea if the state measured school performance in a defensible manner. It doesn't.