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Based on limited metadata with no full letter text available, this warning letter was issued to Tec Laboratories Inc on March 20, 2019, regarding drug products. Without a detailed subject line or violation count, the specific regulatory concerns cannot be determined from the information provided. The FDA's drug regulatory authority was engaged in this matter, though the issuing office details are not specified in the available metadata. To understand the full scope and nature of the violations cited, the complete warning letter text would need to be reviewed.