"This is a good move fully supported by the coaching staff of our school, and as a school we are also very keen to accept any drug education programmes or opportunities being offered."
He said such measures must go hand in hand with the "huge opportunities" and
contracts that were now available to teenage athletes.
"Each year up to 10 or more of our boys will move into a fully professional or semi-professional sporting career.
"They therefore need to be mindful of the demands and expectations that go with such
opportunities during their high school years. Staying drug free is one such
expectation.
"I think the issue is not so much around performance enhancing products such as
steroids - we have no evidence of these expensive products entering the high school
environment here - but it is more around supplements containing banned substances.
"These high school athletes are unaware of the make up of what goes into these
various supplements.
"The supplement industry is large and indeed we even see some shops specialising in supplements, such is the demand."
He said high school athletes had been taking protein shakes "for some years", and they
were not the problem.
"The industry has moved on from protein shakes and more complex supplements have been developed.
"The takers know very little about where these supplements are manufactured or the significance of the components of the supplements relative to drug taking and banned substance protocols."
DFSNZ chief operating officer Scott Tibbutt told Radio Sport Breakfast the tests would not be as comprehensive as those facing other young athletes.
"These tests are just going to be urine tests and we've taken steps to protect these young athletes. We are reducing the screening to make sure we're not catching any innocents.
"It would be highly unlikely that someone tests positive for anything other than a substance they shouldn't be using.
"If, for example, they are taking some medication and they test positive for that medication, they can apply for a retro-active TUE, which means they would have an exemption to take that medication.
"We think we've taken some pretty significant steps that we normally wouldn't take - we don't take the same steps for a teen swimmer or gymnast competing in the open environment," Tibbutt said.
He said the testing programme resulted from studies into supplement and drug use at school level, and a "Good Clean Sport - Youth" education programme that had helped prepare teenagers for professional sporting careers over the past 18 months.
A 2013-14 survey showed "concerning" attitudes towards the use of supplements in school rugby and some players even admitted to taking performance-enhancing substances.
