Testimony was presented in support of and to expand the proposed OSHA standard for exposure to toxic materials during the course of working in a laboratory. The inclusion of a medical surveillance provision which would require new laboratory workers to have a medical examination and would also require periodic examinations during the course of employment was urged. An effective monitoring program was also requested since, as the proposal now stands, the employee is faced with the burden of proof that an overexposure has occurred. The suggestion included the collection and analysis of air and other appropriate samples to be taken so that objective measures of the effect of efforts which are taken to protect workers may be made. It was recommended that a chemical hygiene officer work with the companies in establishing a standard and determining an effective monitoring program. Further, it was recommended that when there is no OSHA standard or permissible exposure limit for a substance, the program adopt the NIOSH recommended exposure limits as opposed to the limit values of the American Conference of Governmental Industrial Hygienists. Finally, employers were urged to furnish information to laboratory workers concerning the toxicity and safety hazards of the materials with which they will be working.