Ashley,
We spoke by phone earlier today.
To answer your question, Load Data... in ArcCatalog does not introduce invalid geometry. Most likely, the invalid geometry exists in the deliverables you are receiving from your vendors and surveyors. You stated that you are receiving file geodatabases as deliverables and you are loading them into SDE. Before you load the data into SDE, I recommend that you make a copy of each deliverable and run the Check Geometry GP tool. If issues are detected, then you can run the Repair Geometry GP tool.
Regarding creating ArcGIS Data Reviewer Checks in a RBJ, when you run the RBJ, by default the Invalid Geometry Check is run. You can disable the Invalid Geometry Check by clicking the Default Checks tab on the Reviewer Session Manager dialog box. However, this is not recommended because some of the Reviewer Checks will not execute if invalid geometry exists. ArcGIS applications are built with the assumption that the feature's geometry follows certain specifications. When the processing algorithms encounter data that does not follow the specifications, the software can return errors or crash, or the operation may succeed without apparent problem but the result may be incorrect.
Regards,
Dan