Should you find a snake and require it to be disposed of contact the police in the first instance.
They will either visit you directly or get in contact with a snake catcher and arrange for one to visit you.
In snake prevention we use mainly Sulfur and depending on the problem and situation other products and mechanical means to prevent snakes intrusion. Sulfur is of an extremely low toxicity but it is always better to prevent pets and children from coming into contact with it.
Please provide us with details on snakes seen previously in and/or around your home / area for us to be able to tackle the problem in a more efficient way.