there are a lot of moving parts and a lot of people working together. >> i would agree. >> i mean, we have been trying to find, has there been national data? how do we prove this as one specific piece for collaboration? i think again, lieutenant, thank you for those words. there are effectiveness. but there's a clear link that this is the safest strategy. it's a work in progress. i am appreciative of ways to come up with data measures so we can say, definitively. this plays in the whole scheme the violence reduction >> i mean, i just want to be clear. it's not impossible. it's difficult and it takes time and resources. if we had the available resources to do an indepth study. it's a serious under taking. >> i followed up that. you know what. it's take it even further. let me say this. it isn't rocket science. may be we don't need the data. >> i can think where crn's have helped. they have been able to put aside emotions. you can call me ernie. i don't call him chief. getting back to the gun buy back. i think we are right in line. we are doing the same buy back. we could use more. i think if you were to talk about gun violence. in 2006. we