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Good luck to you and your son.
This link can give you some info... although it deals in specific poisoning due to accidental ingestion or deliberate suicidal intent.
http://www.hpa.org.uk/Chemicals/compendium/sodium%20hypochlorite/acute.htm
The second may be more appropriate to your needs. There are long term neuropsychological effects that can occur from ingesting bleach over time. Tell him there are better, safer ways to pass drug tests!!!