Government discussions over cutting down on the red tape and bureaucracy surrounding CRB checks, means parents will need to warn their children of potential dangers from other adults a minister has warned.
The government says the system of checks on child workers has become too bureaucratic and plan to drop the checks for adults if someone who has been cleared, such as a teacher, is supervising an activity.
But Lord Bichard warned "dangerous adults" would "take advantage" of the proposed changes.
Lord Bichard, whose report after the murder of Soham schoolgirls Holly Wells and Jessica Chapman by a school caretaker led to the present system being set up, warned the safety of children "must come before our desire to minimise regulation and bureaucracy".
Another minister commented that parents should teach their children about the risk of paedophiles, to help keep them safe. Lord Henley said the current system was "disproportionate" with "unnecessary red tape and discourages volunteering".
The proposal to cut the need for Criminal Records Bureau checks for adults working under supervision with children is part of the red tape-cutting Protection of Freedoms Bill currently being pored over in the Lords.
Deputy Prime Minister Nick Clegg announced the proposed change a year ago, saying he wanted to get the checks "into proportion" and end the "atmosphere of distrust over adults who are simply trying to do their best by their own children".
Lord Henley said "what we are trying to do is create a system that will provide the necessary safeguards but does not make parents feel that their children are automatically safe - parents must still have the duty of looking after their children by warning them of potential dangers".