A good pre-screening method for testing talc in baby powder to ensure safety in the manufacturing industry is to use specialized equipment or techniques to analyze the talc samples before they are incorporated into the final product. This can include conducting tests to check for potential contaminants or impurities that may be harmful if present in the baby powder. Additionally, verifying the source and quality of the talc used in production can also be an important part of the pre-screening process. This helps to mitigate potential risks associated with using talc in baby products.