Saleh Mamman, a former minister of power, was arrested in Kaduna days after being sentenced in absentia to 75 years in prison for laundering 33.8 billion naira (about $24.6 million). Prosecutors say the funds came from illicit gains linked to government-funded hydroelectric projects, including the Mambilla and Zungeru plants. A judge also ordered Mamman to repay an outstanding 22 billion naira to the state. The Economic and Financial Crimes Commission (EFCC) said Mamman had been in hiding since his May 7 conviction.
Mamman joins a string of high-profile prosecutions. Weeks earlier, former acting accountant-general Chukwunyere Nwabuoku received a 72-year sentence for money laundering. Several other senior officials have faced EFCC investigations, and the agency recently declared a former Humanitarian Affairs minister wanted over alleged abuse of office and diversion of public funds.
But analysts and watchdogs warn that a few headline convictions do not necessarily signal a comprehensive or lasting shift toward accountability. Dataphyte, a research organization, reviewed 393 corruption cases between 2013 and 2026 and found only 144 had reached final judgment — leaving more than 60% still pending at various stages of trial. The cases reviewed involved allegations totaling about 3.61 trillion naira (roughly $1.33 billion).
Dataphyte’s analysis also highlights a pattern: most concluded cases involve appointed officials, while those elected to office are less likely to be convicted. Coverage by Nigerian media underscores the disparity: 33 former governors have been prosecuted, but only six have been convicted; some convictions were later overturned on appeal or the individuals received pardons.
Why do so many corruption cases stall? Observers point to structural and procedural weaknesses in the justice system. Cases against elected officials tend to be more complex and layered — involving larger budgets, multiple accounts, agencies, cross-border transactions and complex asset tracing — which lengthens investigations and courtroom timelines. Elected figures also often have the resources and political connections to mount aggressive legal defenses, delay proceedings and lobby for favorable outcomes.
Amina Umaru Miango, a legal expert, says the common tactic is delay: where evidence exists, processes are prolonged until a settlement can be negotiated or until a more sympathetic government is in power. David Alechenu of the Nigeria Anti-Corruption Agencies Strengthening Project cautions that isolated convictions are insufficient evidence of a system-wide breakthrough. He says the true test is whether anti-corruption efforts become systematic, preventive and institutionalized.
These delays and loopholes, analysts warn, allow sustained political influence over prosecutions, erode public confidence in the justice system and blunt the deterrent effect of anti-corruption efforts. Social media and news coverage often spotlight allegations, but the eventual outcomes and follow-through are less visible, and some individuals who appear on EFCC watchlists later return to prominent positions.
The wider cost of corruption is enormous. Nigeria is estimated to lose about $18 billion annually to corruption and financial crimes, much of it linked to public procurement. Reporting indicates that procurement and contract fraud account for roughly 90% of public-sector corruption cases in that sector.
Reform proposals focus on both procedural fixes and capacity-building. Experts recommend specialized, fast-track courts for corruption cases with dedicated judges and streamlined procedures to reduce repeated adjournments and congestion in general courts. Enhancing forensic capabilities, expanding investigative resources and improving cross-border cooperation are also cited as necessary for tracing complex financial flows and assets.
In short, recent convictions of senior officials are notable, but many legal and institutional barriers remain. Unless prosecutions become more consistent, faster and insulated from political interference — and unless governance reforms reduce opportunities for large-scale theft — public trust in the anti-graft campaign will remain limited and Nigeria’s losses to corruption are likely to continue.