You may very well receive a ticket in the mail, it is up to the officer whether or not he writes, and sends you a ticket. He may also refer criminal charges to the district attorney's office. You can check CCAP periodically and see if any criminal charges have been filed.
A citation in the mail would not be the worst possible outcome. You could also be charged criminally with the possession of marijuana and drug paraphernalia, and based upon your apparently admissions, the prosecution would not have to work too hard to get convictions. Once you have one misdemeanor marijuana possession conviction on your record, simple possession becomes a felony.
Your right to remain silent does you no good unless you exercise it, and there is never any percentage in voluntarily speaking to the police.
Consult a defense lawyer in your area about what to expect next, and stop talking to the police.
This answer is provided for general information only. No legal advice can be given without a consult as to the specifics of the case.
Wow, Wisconsin is harsh for such a minor possession quantity. That is surprising to me given the state's relatively permissive view on DUI offenses. Move out west and incidents such as these will not be an issue.
Disclaimer Information on this site is provided by Brian Scott Wayson as general information, not legal advice, and use of this information does not establish an attorney-client relationship. If you have questions about your specific situation, please call an attorney.