The FDA doesn't approve "companies." It regulates products.
Having an accession number does NOT mean that the product is approved. It means that the company has sent an application to the FDA.
If the FDA finds/discovers reason to believe that the company's reported specs are not correctly listed in the application, it then asks for proof of the testing protocols at the company.
If the company either does not provide answers or their answers are found to be false, then the FDA will disallow the import of a product or products. It can also prohibit the import or sale of any products from that company, require the recall of the products, and levy fines.
In order to "know" that a particular laser complied with FDA regulations, you would not only need to know the requirements of the FDA, but you would also need to find the accession number AND search to see if there were any warning letters from the FDA to the company. You would also need to look through the prohibited companies list
Fortunately for us, when considering hand-held lasers, you really only need to look for the five safety requirements to know if a laser is "legal" or not (key lock, delay, emission indicator, integral aperture cover, and power dongle)
If it is missing one of those, it is not FDA approved
Peace,
dave