“The purported purpose of the LIDA was for medical treatments; however, the North Koreans used it as a brain washing device during the Korean War. The big question is: what did they do with the technology?
 It could have been improved and/or made smaller. It is unlikely that they abandoned something that worked.”

This is powerful confirmation that LIDA, the “mini-Woodpecker”, was able to be used on a semi-large scale (an auditorium), and had been used for brainwashing. 
This nefarious purpose was confirmed when Adey was testing the LIDA and an electrician was walking by and asked him where he got the “North Korean brain washing machine” from. Ross told him that it was a Russian medical device. The man said he had been brainwashed by a device like that when he was in a POW camp. Byrd said that they “placed the vertical plates alongside his head and read questions and answers to him. He said he felt like he was in a dream. Later when the Red Cross came and asked questions, he responded with what had been read to him while under the influence of the device. He said he seemed to have no control over the answers.