The BDI is the Beck Depression Inventory, and the SASSI is the Substance Abuse Subtle Screening Inventory.
Both are quick pen and paper screening inventories generally I use them to confirm a diagnosis, or to provide further empirical evidence about a clients problem that I can show to them on paper. As an LPC you will have to have taken classes in tests and measurements again not the extent of a psychologist but it will allow you to read/write an evaluation and to utilize screening inventories or a few other tests. Testing can be a very powerful tool when used properly. They can help you make decisions about care to provide/make a referral/call a psychologist friend to say "haha look at this profile"/cut through denial/or differentiate a diagnosis.
PM if you have more questions about becoming an LMHC/LPC
Jeff