That video that you are trying to say is a very great work by the FBI personnel because he just roam around and keep joining forums and doing a lot of research to finally find out who is behind the marketplace of silkroad until he find out the IP address and locate it and get the person behind silkroad and that is not the only time where bitcoin is being used in crimes because maybe for simple or small transactions, bitcoin is being used illegally.

Hello i have recently bought some bitcoin and litecoin and was wandering what wallet or method is the best to store it in. (From the UK if that helps)

Thanks.

actually I just saw it on a documentary. they may be using anonymous bitcoin transactions, so they can make transactions for criminals freely. but for now, it may be tracked if there is no mixer inside.

Bitcoins has regained its strong value, As of this posting, the value per 1 bitcoin is exactly 4786.59 US Dollar.   Soon we will see more ways people can squeeze the most out of bitcoins.   Since the advent of the internet to be profit oriented in the 90's, no one would possibly have imagined that the Internet would breed Facebook, Google, Uber, online streaming, etc. This is where we are with the Blockchain now. There exists a whole world of opportunities out there.  

These opportunities have the unrighteous users of this cryptocurrencies to also used its advantage. We cannot deny for a fact that cyber crimes have been committed since the birth of the internet.  Once, stealing was done with having guns, now, robbers can easily hack bank accounts or counterfeit credit cards to their advantage.  Sooner, cryptocurrencies can be used to pay crimes such as services for creating counterfeit birth certificates and this is not far from happening.  Actually, the US has already cases on this matter.

Another is the crime of buying illegal-drug emporium that used Bitcoin as a medium of exchange, politicians and policymakers took notice. Criminals, it turns out, really like bitcoins, which can be exchanged for nefarious purposes on the "Dark Web," with complete anonymity and, it seems, impunity.

Although, there are some articles that i have read regarding criminals cannot hide behind bitcoins, still, there are difficulties tracing transactions using cryptocurrencies. That is why law enforcement agencies should have a to change their procedures to pursue criminals who make use of the latest technology to commit crimes. Let the law find a way to evolve to address new tech challenges. There is no reason to expect that law enforcement won’t be able to get a handle on this new cybercrime.