Why do some corruption cases take too long to conclude?

Certain corruption cases are complex in nature hence take too long to investigate especially where they involve international dimensions. Many accused persons, especially those involved in high profile cases of corruption, resort to various legal mechanisms such as judicial review and constitutional petitions which delays the conclusion of cases. Speedy conclusion of corruption cases is constrained by the constitutional safeguards and guarantees that the law gives to due process and the rights of the accused. This is also compounded by capacity constraints in the institutions charged with investigation, prosecution and adjudication of such cases.