Translation of Mittäter

Mr. Chang informed me that you have a customer that requires similar applications to what my customers have here in Switzerland. I am planning my next trip and I will consider visiting you too.
We all know that the consequences are awful. All are struggling, some kill eachother, mostly for really foolish reasons. They are not aware of it. Drugs should never be tolerated in any country.
Is there a way that I could test your Spanish and German lessons? Quality is very important to me. Can you send me a lesson electronically (by email or word)? Maybe you have your lesson ready.