Can I call the police on this one kid?

Ok well today after school this kid told me he was going to get me 200$ of weed for 100$ so I went..and we went to a apt. complex..and told me to wait outside and give him the money so he can go in and get it so he went and he came out saying he got robbed by some black guy..(Witch I know he didn't) Can I call the cops on him do I need proof or what do I need to do?