▁did ▁not ▁know ▁the ▁scient ist , ▁until ▁the ▁F BI ▁demonstrated ▁proof ▁of ▁the ▁conversation . ▁Despite ▁some ▁evidence ▁that ▁could ▁have ▁kept ▁the ▁case ▁open , ▁the ▁F BI ▁closed ▁this ▁file ▁on ▁Lee ▁in ▁ 1 9 8 4 . ▁ ▁Lee ▁did ▁not ▁get ▁the ▁attention ▁of ▁the ▁F BI ▁again ▁for ▁ 1 2 ▁years ▁until ▁ 1 9 9 8 . ▁The ▁F BI ▁had ▁lost ▁the ▁file ▁on ▁Lee ▁from ▁the ▁ 1 9 8 3 ▁and ▁ 1 9 8 4 ▁meet ings ▁with ▁him , ▁and ▁had ▁to ▁re construct ▁the ▁information . ▁In ▁ 1 9 9 4 , ▁a ▁deleg ation ▁of ▁Chinese ▁scient ists ▁visited ▁Los ▁Al amos ▁National ▁Labor atory ▁in ▁an ▁un ann ounced ▁capacity ▁for ▁a ▁meeting . ▁One ▁of ▁the ▁scient ists ▁visit ing ▁was ▁Dr . ▁Hu ▁Side , ▁the ▁head ▁of ▁the ▁Chinese ▁Academy ▁of ▁Engineering ▁Physics . ▁He ▁also ▁was ▁cred ited ▁with ▁the ▁design ▁of ▁the ▁small , ▁W 8 8 - like ▁weapon . ▁However , ▁despite ▁the ▁visit ▁being ▁un ann ounced , ▁Lee ▁showed ▁up ▁to ▁the ▁meeting ▁un inv ited . ▁ ▁This ▁al ar med ▁L AN L ▁officials ▁who ▁contact ed ▁the ▁F BI , ▁which ▁opened ▁up ▁another ▁investigation ▁of ▁Lee . ▁On ▁December ▁ 2 3 , ▁ 1 9 9 8 ▁Lee ▁was ▁given ▁a ▁poly graph ▁test ▁by ▁W ack en h ut , ▁a ▁DO E ▁contract or . ▁He ▁was ▁not