The technology that is used for catching dolphin-safe tuna is a particular type of net or fishing technique that assures the safety of dolphins.
It appears that there is not a particular type of technology that they use, but they are explicitly not allowed to use drag nets. Additionally the dolphins must not be killed or severely injured while tuna is being fished, and they are not allowed to be encircled or antagonized. It appears that the use of drag nets led to dolphins becoming entangled and drowning as they are mammals and must be able to surface for air.
Here are some fishing techniques that seem to be allowed for dolphin safe tuna fishing.http://www.healthytuna.com/environment-sustainability/fishing-methods-dolphin-safe
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