There was a study done in British Columbia of the incarcerated population. They found over 60% showed signs of a prior brain trauma.

The homeless are often in the TBI group for two reasons. They may have suffered a TBI that resulted in their homelessness or their homelessness has put them in dangerous living situations where they have suffered mTBI or TBI.

Many with addiction problems use the addictive substance to self-medicate for their neurological, psychological and psychiatric problems.

Consider how difficult it is to maintain family and social relationships after suffering a TBI. As support is withdrawn do to the personality and employment struggles, the subject is left without resources. Living the homeless life may actually do a better job as many in the homeless population know to give each other plenty of relational space. The diagnostic term is schizoid disorder.

The judgement that can come from family and friends of "just buck up and get over it" is no longer beating the TBI subject up.

This is why we need more Brain Injury Trust Funds and better diagnostic procedures to identify the TBI and mTBI subjects.