LOS ANGELES (AP) — The leader of the nation's second-largest school district wants to put the brakes on an ambitious $1 billion plan to place iPads in the hands of every student after some of the first to get them used the devices to Tweet, text and play games rather than study.

Los Angeles schools Superintendent John Deasy's original plan was to get iPads to all 650,000 of his district's students by the end of next year.

Concerns were expressed that that might be too ambitious after some of the first to get them cracked their security codes and began surfing the Web.

Now Deasy wants to slow the roll-out, completing it by the end of 2015. The Board of Education is to take up his proposal at the end of this month.