It said police had been informed and the 'small number of pupils' offered substance misuse support.
The White Paper also repeats the government's aim to reduce substance misuse amongst young people.
The scheme at La Moye targets behaviour that can lead again to crime, such as alcohol and substance misuse.
That post is held by Marion Walker, who is also clinical director of Berkshire Healthcare NHS Foundation Trust's substance misuse service.
The National Substance Misuse Strategy has recommended that drinks industry sponsorship of sport and other large events be phased out by 2016.
The National Treatment Agency for Substance Misuse, which is to go, has been heavily criticised for spending billions of pounds on schemes with little proof they work.
Gwent Police said children who go missing can be at risk of harm from threats such as physical and sexual violence, substance misuse and involvement in criminal activity.
The commission will also carry out national reviews to improve performance in areas including children's hospital services, hospital acquired infection, heart failure, substance misuse, tobacco control and mental health.
In an earlier statement, the Welsh government said while it understands that substance misuse is not confined to urban areas, the new funding formula is "evidence based and takes rural areas into account through indicators on access to services locally" among other factors.
"By bringing order to their chaotic lives, we will not only help those with substance misuse problems but also improve the lives of those around them - their family and friends - and local communities who may be suffering from the impact of drug-related crime, " he said.
BBC: NEWS | UK | Scotland | Protection for addicts' children
In April it became the first drug to be banned temporarily under new government powers, after which the substance was referred to the Advisory Council on the Misuse of Drugs (ACMD) to consider whether the ban should be made permanent.
BBC: "Legal highs" mexxy and black mamba banned by government
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