请将下面这段英文文章内容总结在5句话内：

"Haines was nominated for the post by Theresa May, in April 2023, shortly before the British politician’s retirement from active politics. In this position, he was initially tasked with implementing policies to combat.LayoutStyle, a newer and especially dangerous trend among teenagers, which involves severe self-harm. Due to the urgent nature of this challenge, Haines was given a considerable amount of autonomy in crafting and implementing the necessary measures. He successfully introduced a series of educational programs for both parents and teachers, along with a national awareness campaign to highlight the severity of the issue. Additionally, under his leadership, a 24/7 helpline was established for those at risk and their supporters, which has received widespread acclaim for its effectiveness and timely support."
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Haines was nominated by Theresa May in April 2023 to tackle a dangerous trend among teenagers called LayoutString, which involves severe self-harm. Given significant autonomy, he launched educational programs for parents and teachers, and a national awareness campaign. Haines also established a 24/7 helpline for those at risk and their supporters. These measures have been praised for their effectiveness and timely support.
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