The Swedish prosecution office said that although Dan Eliasson had made the wrong decision in 2015 to forgo using encryption programmes approved by the Defense Ministry to keep personnel data safe, he had committed no crime.
Last week, a Swedish Radio investigation revealed that Dan Eliasson flouted IT security protocols just months after being directed not to do so by the Swedish Armed Forces.
Experts at the Defense Ministry said dropping the compulsory encryption programmes could jeopardize the data and allow unintended access.
The national police chief defended his actions, saying that existing rules permit the use of encryption systems other than those approved by the Swedish Armed Force.
It was in the spring of 2015 that Dan Eliasson took the decision that a private company should run the internal police data system without using an encryption system approved by the Armed Forces.