Investigating someone before marriage involves conducting a thorough background check to verify their personal, professional, and financial details. Here are some steps you can follow to investigate someone before marriage:

1. Conduct an online search: Use search engines and social media platforms to gather information about the person you are considering marrying. Look for any red flags or inconsistencies in their personal information, employment history, education, and social media activity.
2. Verify their identity: Ask the person to provide you with their identity proof, such as a passport, driver’s license, or Aadhar card. You can also use online verification services to confirm your identity.
3. Check their criminal history: Conduct a criminal background check to see if the person has any past criminal record or history of violence, fraud, or other criminal activities.
4. Check their financial history: Verify the person’s financial history, including their credit score, bank statements, tax returns, and employment history. This can help you understand their financial stability and any outstanding debts or liabilities.
5. Verify their family background: Conduct a background check on the person’s family members to see if there are any red flags or potential issues that could affect your relationship.
6. Hire a detective agency: Consider hiring a reliable and experienced detective agency to conduct a thorough investigation. They can provide you with detailed information on the person’s background, including their personal, professional, and financial details.

It’s important to approach investigating someone before marriage with sensitivity and respect. Be upfront and honest with the person you are considering marrying, and make sure they are aware of the investigation. Remember, the goal of the investigation is to ensure a successful and happy marriage.