Securing the participation of criminally accused person in criminal proceedings with focus on criminal custody Abstract The thesis deals with each individual option how to secure the participation of prosecuted person for criminal proceedings to the extent which is necessary for the criminal procedure to fulfill its purpose. This is why there is a focus on the "ultima ratio" principle when it comes to application of such institutes. It is an indispensable part of criminal procedure where certain personal rights come into a conflict with the effectivity of prosecution. The core of this thesis is built on legal and constitutional acts of the Czech Republic considering decision-making practices of Czech courts and also the European court of hu...