The drug ice "has been the evilest drug to ever hit the planet" and dealing with it is becoming a tough challenge for families, says Peter Lyndon-James.
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A former criminal who has spent time in jail, Mr Lyndon-James is open about the changes he has made in his life and held a seminar in Albury on Saturday called "Tough Love".
More than 100 people went to City Central Church to hear what he had to say.
"Methamphetamine turns the people that you love the most into the people you hate the most," he said.
"It's wiping families out."
Mr Lyndon-James' theory was that everyone has a light and a dark side.
"We are the ones who determine the direction of our life, we are the ones who determine how we handle it," he said.
"The dark wants to destroy you and not just you, your whole family, and the light wants to love you and your whole family.
"You are who you are because of the decisions you have made."
People were asked to think back to when they were first offered drugs or alcohol.
Mr Lyndon-James said some people who start do it to have a sense of belonging, then it can turn into addiction.
But he offered advice on how to be there for family members, saying someone who thinks they are useless and no good is listening to the dark side of their brain.
"Sometimes it takes a person on the outside to show the person on the inside what they can't see," he said.
Mr Lyndon-James argued that children are programmed by their parents, school and other children they spend time with, which helps them form patterns of behaviour.
"We have a responsibility to model how we want our children to be," he said.
"You're being programmed in the way that mum models motherhood in the home and the way dad models fatherhood in the home. Children look up to you and watch what you do, and they actually copy what you do."
We have a responsibility to model how we want our children to be.
- Peter Lyndon-James
He said allowed his own 15-year-old son to make his own decisions, but set boundaries of having love peace and honesty in the house, and telling him to not use drugs on or off the property.
"You have a responsibility to come alongside that child, to teach that child, to equip that child, to empower that child - and to equip it with the skills to actually live life," Mr Lyndon-James said.