I agree Jilly, LE is sharing nothing not required by law. The search warrants they have to forward - at least the ones pertaining to JY's property. I suspect that people interviewed by LE have been told to expect a defense interview - the choice of if they talk to that person is theirs alone. LE or the DA can advise but that's it.
The interesting thing about NC, and I will have to search a bit further to find this out for sure - there is no reciprocal discovery requirement. In other words, if JY is charged, the defense does not have to share anything developed during their investigation except for information relating to alibi witnesses. I'm still searching the codes for a better understanding of this.
RC