Understanding Civil and Criminal Cases
Police never book a civil case, and an FIR cannot be filed for a civil matter. This is very basic and preliminary knowledge that every law student possesses. The fact that an FIR is lodged against an employee, that he is in custody, and that he is likely to be released on bail is sufficient to indicate that a criminal case has been filed against him, and this is not a civil matter. Interestingly, certain complaints such as missing persons, found persons, found property, and lost property are civil in nature as long as there is no crime involved.
Differences Between MPs/MLAs and Employees
The law relating to representatives of the people (MPs and MLAs) is different from laws pertaining to service and employment. They differ conceptually. MPs and MLAs are not paid servants, and as such, there are no service rules for them so that their employer can take any action. However, being public figures, citizens expect them to be morally upright. But, alas, this remained only a dream until the Apex Court intervened. So, there are certain rules now framed for persons against whom an offense has been proved and they are held guilty.
Implications for Government and Private Employees
In the case of a government servant, if he is arrested and is under custody for more than 48 hours, he stands suspended because of a specific provision in service rules. However, this is not the rule for private industries. If an employee is under arrest unconnected to his employment, at the most, he will have to be treated as "unauthorized absent on work," and depending on the circumstances, such as any connection to his conduct and employment, his employer has a right to take disciplinary action. But, his employer cannot shut doors for him without following the procedure of law and the principles of natural justice. In the case of an arrest totally unconnected to employment, I doubt his employer can even issue him a charge sheet merely for his arrest by the police.