According to the DSHS website, opt outs are good for2 years. But the. Plan was to change to1 in 2007. I think that was one reason the TMA turned on the. Governor. (On phone, so no links for reference. )
All I know is my daughter opted out, one time in 2003 and never has to opt out again of ANY immunizations. It was the law at the time. Now if you didn’t opt out in 2003, you can’t do that, it’s every year since the nice RINOs and democrats changed it in 2007..