The constitutional aspects of criminal law and criminal procedure only began to receive serious attention in Finland in the 1990s. The remarkable change in legal thinking and practice in this respect was connected to two major legislative reforms: firstly, Finland ratified the European Convention on Human Rights and Fundamental Freedoms (ECHR) in 1990 and, secondly, new provisions on fundamental (basic) rights were incorporated in the Finnish Constitution in 1995. A fully revised new Constitution of Finland was enacted in 1999 (to be entered into force on 1 March 2000), but the substance of fundamental rights and freedoms was confirmed already in the constitutional reform of 1995.
Those aspects had not, however, been completely overlooked before. Most of the relevant human rights treaties were eventually ratified in Finland (e.g., the International Covenant on Civil and Political Rights, CCPR) and, when ratified, they were incorporated into the domestic legal order. Nevertheless, courts or administrative authorities very seldom referred to human rights treaties or constitutional rights before the late 1980s; a tradition of invoking constitutional rights in the courts was lacking. Instead, human rights treaties and constitutional rights were primarily regarded as binding the legislator.