heroic rescue of his drowning nephew. and a new study suggests couples who smoke marijuana are less likely to suffer domestic violence. scientists say more research still needs to be done. those are some of the top stories on this thursday, august 28th. announcer: from abc news, this is world news now. good morning. happy thursday. yeah, very good thursday. friday just around the corner. and labor day weekend as well. looking forward to that, but first we want to begin this half hour with a story that has no winners, losers only. the father accused of shooting the drunk driver who killed his two sons has been acquitted. he says this is not a time to celebrate. abc s kirk hawkins has more. translator: david barajas emerged from a texas courtroom minutes after his acquittal and appeared to be in shock. i don t think it has set in yet. reporter: barajas was accused of shooting and killing jose banda, the drunk driver who hit and killed his two young sons. police say