38. Is there a ban on vote buying?

Section 90. Hindrance of Exercising the Right to Vote, the Right to Participate in Initiation of Legislation, Initiation of National Referendums and Supporting of the European Citizens' Initiative
(1) For a person who knowingly commits hindrance of exercising the right to freely participate in a collection of signatures organised in accordance with the laws of the Republic of Latvia for the initiation of legislation or national referendum or for supporting of the European Citizens' Initiative, by the use of violence, fraud, threats, payoffs, or other unlawful means, the applicable punishment is the deprivation of liberty for a period of up to one year or temporary deprivation of liberty, or probationary supervision, or community service, or fine.
(2) For a person who knowingly commits hindrance of exercising the right to freely elect members of the parliament and to be elected or to freely participate in a national referendum organised in accordance with the laws of the Republic of Latvia, by the use of violence, fraud, threats, payoffs, or other unlawful means, the applicable punishment is the deprivation of liberty for a period of up to three years or temporary deprivation of liberty, or probationary supervision, or community service, or fine.
Criminal Law Article 90.

Vote-buying is explicitly criminalized.