US establishment need DEA Registration as an Importer, if they have requested the registration based on Import requirement. Please review the below link from DEA website.
Notices - 2004 - Importing Controlled Substances From Canada and Other Foreign Countries------------------------------
Gaurang Bhavsar
Edison NJ
United States
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Original Message:
Sent: 16-Mar-2017 09:44
From: Tom Stothoff
Subject: DEA License requirements for foreign manufacturing sites
Thank you David. I may not have been clear in my question. The foreign site I was referring to is in the UK. Our PR distributor is asking for a DEA License for the UK facility. So my question is; would the UK site be required to have a DEA license? The UK facility does not currently have DEA license (only a MHRA license) and has been manufacturing our product for the US for over 5 years now. This makes me think foreign sites do not require DEA licensing, but I'm trying to find a reference to provide to PR that supports foreign this.
Tom