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・ When management is not performed sufficiently at the supplier despite of possible contamination of RoHS substances due to parallel production, recycled materials (open/closed) or concentration change in solder bath, the company conducts analysis using chemical analysis devise (XRF, ICP, etc.)
Proper evidence is shown in the next examples
・The company collects and verifies the analysis data of initial delivery from the supplier and carries out periodical incoming analysis for every lot of products
・Periodical analysis of the end product at the customer
・If a purchased product is a material, the company collects the certificate of material issued by the material manufacturer"