This goes with the previous chapter.
Larger retailers or buying companies usually have their sample tested professionally before placing an order. This is done either by their internal lab or a third party. If you would like to make absolutely sure that your product conforms to regulations and is up to quality standards take this step. It will usually cost you a few hundred USD, depending on the third party. I recommend this step if your item is costly and your quantity is larger than 500 pieces or 2000USD in total value. You will usually receive a test report that you could also send to your supplier and ask for his feedback or improvement of the product before order placement.
Today there are many basic requirements that need to be met. For example, chemical substances in plastic or textiles are not allowed to exceed a certain amount within the product. Some items need to have a certain certificate (such as FCC, RoHS or CE), which means that the product is preapproved under certain criteria and OK to import.
Of all the smaller companies that drop-ship or have smaller order quantities I know for a fact that 95% of them don’t have their items tested for chemical substances or other technical requirements. If you drop-ship directly to your customers (for example FBA-fulfillment by Amazon) you won’t get into trouble. But if you are selling to larger companies or wholesalers they will probably ask you for test reports.
If you (or the third party) found anything that you would like to change or have explained ask your supplier to look into this, either to improve the product quality or give you feedback on any problem. Make sure that the supplier will fix any problems, and indicate to him that (in case of an order) you will test again during the inspection (performed by third party, Chapter 23).
Bear in mind if you are a start-up or planning your first import this step may not be necessary as it adds cost to your product.
However, if you have an existing business and are trying to expand into larger importing this is an absolute must.
Depending on your product you can check general requirements here:
Finding inspection and third party companies that can tell you what needs to be fulfilled is covered in Chapter 23.