For all of the junior lawyers out here, go in tomorrow and tell them you are not allowing them to look through your stuff while on company property and if they do that you are going to file a lawsuit. Bottom line-their ball, their game, their field, their rules.
It is exactly people like you which they like and will continue to pursue such silly things...this is by no means an insult to you so please do not take it that way, it is simply a point in fact...because someone tells you they can do whatever to you, many will adhere to that belief simply because they know no better...in situations like this, corporations tend to grasp the "ignorance is bliss" attitude and press on with business...
So until a few people are terminated for this, bring a class action suit, conway and every other corporation or entity for that matter will continue with the practice...now i am not talking about the occassional individual who meets all criteria for being searched, getting caught with contraband of some sort and subsequently terminated based on solid probable cause, but for the person who comes to work, pulls into the yard with the TM and whoever else standing there waiting to search only your vehicle because they have a suspicion or a belief you are up to something no good...probable cause should apply in these situations unless complete randomness is demonstrated...
By no means am i an attorney, nor presume to be, my knowledge of the law is derived from my own studies and experiences which include the study of some case laws and such...the bottom line is simple..conway wants to search you or your stuff, unless you are prepared to look for new employment, have the money for an attorney, then your choices are really limited...but the choice is yours not conways.