There are a lot of threads about it and there is no need to creat more...
All we know that bitcoin is not a favourable tool for cyber crime because its easier for investigative agencies to investigate criminal activities with bitcoin,first of all companies are trying to find new ways which will facilitate the investigation,for example I have just heard about bitfury's new project known as crystal(A Blockchain Investigative Tool for Law Enforcement and Financial Institutions),I don't have time to read more about this but you can see here or their website,(http://bitfury.com/content/4-press/1_30_2018_bitfury_releases_crystal.pdf)