Trading and selling various illegal goods made it far more difficult to run such a group, as it required a way to produce or purchase them before selling them as a product from the organisation.
Not only would they need to be produced or purchased, but they would have to be stored somewhere before being distributed to the lower ranks of the organisation to sell them.
There could be many things that could go wrong with each of the processes, which could easily lead to a severe loss of money and could lead to the downfall of any organisation.
All the police needed to do was to work out where such things were being made or where they were being stored, for they to be seized and used as evidence.
It was the same for any enemy or competitors who would want to get their hands on any of it or cause damage to an organisation like Cerberus.
