Leavers' festivities in the South-West turned ugly yesterday after a security guard was assaulted and brawls and thefts at caravan parks caused many schoolies to head home early.
However, at Rottnest, police likened the behaviour of 1500 leavers on the island to "boy scouts".
Sgt Pete Bahen said leavers were no trouble, despite ejecting seven.
In Busselton, police charged a 17-year-old with assault occasioning bodily harm after he allegedly punched a security guard in the face at Four Seasons Caravan Park.
More than 5000 schoolies have been in the South-West since Sunday. But some leavers headed home yesterday after a spate of thefts left them with little more than their clothes.
Sgt Graham Clifford confirmed there had been a number of thefts at caravan parks, with most at the Four Seasons Caravan Park.
Dunsborough Lakes Caravan Park, which hosts more than 800 leavers each year, had more than 60 volunteers working on site and ejected just three leavers.
Sgt Clifford said leavers generally had behaved extremely well.