teaching assistant has been suspended after a colleague discovered white powder in her bag .
it has been reported that lisa heath , 45 , an assistant at willowtown community primary school in gwent , admitted carrying class b amphetamines after police were called and quizzed her .
she initially denied the drugs were hers , saying they had been planted on her , but later changed her story , accepting a caution for possession .
gwent council has confirmed that the school immediately suspended the member of staff following .