Note that while certain counties (including Miami-Dade) have passed measures allowing police to charge small marijuana possession as civil fines, it's still a misdemeanor under state law ($1000 and/or a year in jail) and it can be charged that way.
Unless we're quibbling with the fine amount on a civil violation (in which case the previous poster is almost certainly right plus $100 is not fixed in stone in the statute, they may have raised it), you need a lawyer.

