Google "asset protection of single member LLC" to find a trove of scholarly/legal articles on the subject, add your State for State specific explanation.
Basically, the LLC derives its existence from "partnership laws", just as it sounds partnerships entail two or more owners. As a result, the majority (if not all) States have case law on point where the Courts do not extend asset protection where there is only 1 owner of the LLC.
Here is the Florida Supreme Court Case on point, but I am certain you will find a similar case in most other jurisdictions, and if you do not find a case from your state, more likely than not it is because they did not hear a similar case yet (LLCs have only been existed in the US since 1977, and States slowly adopted the concept over time), not because they have case law going the other direction: http://assetprotectionworld.com/wp-content/uploads/2012/06/O...
Basically, the LLC derives its existence from "partnership laws", just as it sounds partnerships entail two or more owners. As a result, the majority (if not all) States have case law on point where the Courts do not extend asset protection where there is only 1 owner of the LLC.
Here is the Florida Supreme Court Case on point, but I am certain you will find a similar case in most other jurisdictions, and if you do not find a case from your state, more likely than not it is because they did not hear a similar case yet (LLCs have only been existed in the US since 1977, and States slowly adopted the concept over time), not because they have case law going the other direction: http://assetprotectionworld.com/wp-content/uploads/2012/06/O...