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Agency approvals have their boundaries, when it comes to legal authority.

When we did the world's 1st ISDN Broadband WAN with DS1 to 100 homes in 1979, I was amazed our customer MTS did not care about FCC and supplied their own power from central office batteries. That was until I used a Canadian Tire charger as a backup to the subscriber terminal motherboard in the basements modified with an LED and DC power switch. We had to get a Provincial waver for $50 because it was illegal to use a modified UL/cUL approved equipment on customer premise. (LOL).  (Although we invented our own emission and susceptibility tests for good measure with oscillating relay coils on antenna and spectrum analyzers for emissions.)