Air carrier ground personnel reported multiple FAA/IATA violations of undeclared Hazmat cargo that were scheduled to be transferred from a cargo aircraft to a passenger aircraft.

Narrative

Company is tendering numerous items in colored bags on a daily basis in which we are finding undeclared DG's (Dangerous Goods) during the cargo screening process. There have been previous issues with this and three in the last two weeks. Last call with customer advised that these DG's are acceptable on aircraft (without documentation) but not on passenger planes and have to be labeled and declared as dangerous goods. She advised that the company has no way of identifying them to ensure they are not transferred to another aircraft which then become undeclared DG and is up to our service partner to identify during the screening process. This is especially concerning because a majority of these destinations are stations and flying on aircraft which are extremely limited as to what dangerous goods they are permitted to carry with the FAA. It is the customers responsibility to have all dangerous goods shipments declared; labeled and packaged in accordance with FAA/IATA regulations. These have all been reported.