If someone suspects their wealth may not be entirely halal (permissible according to Islamic law), they should consider the following steps:

1. Review Sources: Examine how the wealth was acquired. Ensure that all sources of income and investments comply with Islamic principles.
2. Consult an Expert: Seek advice from a knowledgeable Islamic scholar or a financial advisor specializing in halal investments to assess the situation.
3. Audit and Rectify: Conduct a thorough audit of financial dealings. If any transactions or investments are found to be non-halal, take corrective actions to address them.
4. Repent and Purify: If you determine that some of your wealth is non-halal, repent and seek forgiveness from Allah. You should also give away the questionable amount as charity (sadaqah) to purify the wealth.
5. Learn and Apply: Educate yourself about Islamic financial principles to prevent future issues and ensure that all future wealth is earned in accordance with Islamic law.