The training the officer desired was a solid seminar that I was very familiar with, and it was valuable training. But there were some questions yet to be answered regarding the department's refusal to foot the bill.
I am sure as a young patrol officer he was not privy to his department's training budget. Training budgets are usually the first budgets slashed and its remains pillaged first. It would be rare for a department to allow officers this much funding on a fair or regular basis. So, how badly did he want to go?
Throughout my career I have taken my own time off to attend special training and yes, I have many times paid my way. If it is that important to you and your career interests, suck it up and spring for it yourself.
You may view this as a way to insure future assignments or promotions. This is your career here and sometimes you must make sacrifices. In your department, there are some who think "if the department wants me to go, they will send me." To me they are like the wallflowers at the prom and will never get the opportunity to dance. Oftentimes your personal drive will have to take you there.
Besides, if you have that much interest in the topic matter, you will go; even on your own dime. Granted, if you are a younger officer, available training dollars could be directed to the more veteran officers; you could get told to wait your turn. Take the initiative!