The most a person (age 21) can be fined for a first conviction of driving while under the influence of intoxicating liquor with no injury involved is?

Even with no injury involved and with the legal drinking age, driving under the influence is not taken lightly and could be extremely costly. The financial timeframe of a conviction could play out for many years and could add up to around $20,000 by the time everything is over. Always ensure that you're driving sober to avoid such costly penalties.