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This study aims to assess the relationship between internal control weakness and different types of auditor opinions in fraudulent and non-fraudulent firms. The study's main objective is to investigate fraud in business firms and analyze internal controls and types of proposed opinions by the auditor about his desired firm. The outbreak of fraud in firms is of utmost importance to a broad spectrum of society. Internal controls and the auditor's role in preventing and detecting frauds should not be taken for granted.

The present study's statistical population includes 179 listed firms on the Stock Exchange selected as the study sample using the systematic elimination method during 2012–2019. As the study's dependent variable (the type of auditor’s opinion), research hypotheses were analyzed using the Logit regression model.

The results show that the relationship between internal control weakness and opinion type is significantly different in fraudulent and non-fraudulent firms. Moreover, the relationship between internal control weakness and type of auditor opinion in fraudulent firms and the relationship between internal control weakness and type of auditor opinion in non-fraudulent firms are significant.

By assessing the related literature, the authors have found no study to directly assess the comparative relationship between internal control weakness and the type of auditor opinion, which can be named as the main objective of the study.

This study aims to assess the effect of corporate lobbying power on fraud and money laundering in listed firms on the Tehran Stock Exchange. For the study, the information of 173 firms is assessed during 2013–2020, and a total number of 1,384 year-companies are analysed.

In this paper, the Beneish model is used for fraud detection, and the clause of the auditor’s report on money laundering is used for the variable of money laundering. The multivariate regression, Logistic regression, the fixed effects of panel data, additional random effects tests, Hausman, least generalised squares and T + 1 are used by using the Stata Software.

The obtained results indicate a direct and significant relationship between lobbying and fraud and lobbying and money laundering. Suppose the board members of firms are among the parliament members or the government cabinet (politicians) and/or major shareholders affiliated with state-owned and/or quasi-governmental institutions. In that case, the likelihood of corporate lobbying will be increased.

The outcomes of the current study give great insight to developing countries due to the high volume of money laundering to reduce such a financial crime.