Parents charged and convicted for murdering an adopted child and grossly abusing their other children used the book mentioned, which cites biblical doctrine and advises 'spare the rod and spoil the child', as a guide for child-rearing. Many are calling for Amazon to end sales of the book.
The authors advise parents to go to Home Depot to buy plumber's supply line for disciplining children. It's very convenient, they say, because "it will fit in your purse or hang around you neck." http://theologica.ning.com/profiles/blogs/to-train-up-a-child-an