Can DEA agents legally do this?

Yesterday my Mom and I ate lunch in one of our favorite local Mom 'n Pop cafes. My Mom is 87 and can walk, but is so slow that I use a wheelchair when I take her out. As we left the cafe to go back to the car, we were surprised to find 6 or 7 large trucks parked right in the street. Nobody was in them, they were just sitting there. They were not marked, and they were trucks like Ford F150s and whatever the Toyota equivalent of that is. Just all parked haphazardly right in the street, not on the sides of the street. One was blocking our car from getting out of its parking space. There was nobody around, except that at a small business two doors down from the cafe, there was a middle-aged blond woman wearing a black vest that said DEA on it. She was talking into a walkie-talkie and didn't seem to notice us. I put my Mom in the car, and I was doing this, a man came by and offered to help. He was also wearing a black vest. I said I didn't need help getting her in the car, but that we were blocked in by one of the trucks. He said, "We'll move it in just about 2 minutes." About one minute came by and a different guy came out, much younger, he must have been only about 18. He got into the truck that was blocking our car, then got out and started to walk back into the building, but I called to him and said, "Could you take this spot if we leave? We're blocked in." He said, "Where were you just now?" and I said, "We just ate lunch at that cafe." He just said, "OK" and got back in the truck and moved it so we could get out, then pulled into that parking space. I guess he thought we might have been inside the business that was being raided. I felt like we were lucky that they were out there so I could ask them to move it. I kept thinking, what if my Mom had a medical emergency at that time, and I had to get her to a hospital? How can they legally block cars that are parked in marked public parking spaces on a public street? And if they can, how long are they allowed to block cars? Later on, on the evening news, we saw that there were raids on about 10 locations in San Diego which were selling marijuana as "medical marijuana" and that happened to be one of the locations. We just got unlucky that we were parked there. Are DEA agents legally allowed to park on a public street, blocking any traffic from moving in either direction on that street, and blocking parked cars?

Yes they can.

Matter of factly, they could have, legally, demanded a full scale search of you and your mom and given you a "sorry about that, just doing our job" for the trouble.

If there had been a medical emergency they would have moved vehicles, if not give you an escort to the hospital.

It all depends on the individual agent.