Let me answer.
Initially, you need to look not at the essence of the problem, but at its manufacturing date.
The law on private detective work was adopted in 1992, respectively, was prepared and adopted in various interpretations even earlier - 1990-1991 i.e. within the framework of a civilian, administrative, etc. etc. productions ...
In 1993, a new constitution of the country was adopted and most of the norms of existing legislation are brought in accordance with it.
The law on private detective and security activities in the Russian Federation has not changed in the context of this article.
Theoretically, and practically administrative and civilian branches are different branches. However, the Legislator, at the time of the invention of the law on private detective and security activities (within the framework of democratic trends of that period and fashion to follow the West), probably meant by the term "collection of information on civil cases" and civil and administrative cases, including arbitration (arbitration court in the Russian Federation, as an independent branch appeared only in 1991) more precisely, the law that was written meant only civil law, not imagining that over time separate and extensive types of administrative and arbitration proceedings will develop and disputes and proceedings on them will be on a par with civil and criminal cases ... in addition, look, the law on private detective and security activities has been modified more than 20 times over 20 years, but these provisions have not undergone changes precisely because (in my opinion) this is not an essential issue of this law.
So, from the point of literal interpretation of the law, you are right - the detective cannot collect information on either administrative or arbitration cases ... however (again, in my opinion) if you write paragraph 1, h, into the contract for the provision of detective services with a client .1 Article 3 of the Law (collection of information on a civil case) the number of the administrative or arbitration case and collect the relevant information on it and submit them to the court, they can be taken as evidence. But let your opponents in court prove that you did not have the right to collect information in this industry and this direction .... at the same time there will be a judicial precedent pushing our legislator to issue a separate law on private detective activity in the Russian Federation and a clear description all the rules and regulations ....