First things first. Don't worry about him "taking" the kids. Puh-leeze...you as a SAHM are what they are used to and a court is not going to upset the apple cart. How, as a working electrician is he going to be able to justify taking care of all of them? What? Is he going to hire a wet nurse? At the worst, opinions of the older kids, like the 16 year old may come into play if they were asked who they wanted to be with, barring visitation for the other spouse.
Based on his reactions alone, I say guilty. As someone with actual brain damage, I can tell you, given your H's excuses, there is no way I would fall for the ole "I told you about these before" because given you've already noticed suspicious things or behavior, you'd be right on it the first time like a bloodhound.
That said, I've also thought of a couple of things. There may be a chance (just a chance) he's visiting strip clubs & getting private time in the back rooms. The worst of these places offer BJ's to the whole works, the lesser may offer whatever is possible w/o skin to skin contact, say simulating a BJ with kissing or blowing warm air. This would fit into the lipstick marks, his dirty black shorts, stray hairs and have you ever seen glitter? These gals (not to mention something OW also do) seem to leave behind something for the wife to find.
When I was okay with strip clubs (not anymore) my H usually went w/a friend or two (and I didn't know what lap dances could actually become)he'd have to strip when he came home..because I'm horrendously sensitive to whore perfume, hehe. But omg, the condition of the outside of his pants, well there was usually makeup transfer & glitter. He noticed it too & quit wearing dark pants on his other, soon to be short-lived, visits.
That said, since your H didn't admit to even this, chances are it's probably something or someone else :(
I'll give you an excuse to use so you can pretend to drop the matter...if it fits into your H's toileting habits. I noticed the center of his waistband on his tighty whities looked worn. This makes me wonder if when he goes to wee, he just pulls them down under his johnson, rather than pull it through the space built into the jockies for that purpose. Assuming this, and also he was talking about chalk, and not caulk, go here: http://www.homedepot.com/h_d1/N-5yc1v/R-100038588/h_d2/ProductDisplay?catalogId=10053&langId=-1&keyword=chalk+line&storeId=10051
This is a type of chalk that is used in construction jobs to set a straight line by nailing the string on top (which goes through the chalk filled bob to the bottom, then a person holds the bob and snaps a straight line. Now hold that thought. Let's assume he's set a line or came in contact with the red chalk..nature calls. He pulls down his waste band and then using most likely his left hand, he pinches his jockies to lower them with his thumb and index finger & uses one more to help lower them under his johnson. That being accomplished he uses his right hand to hold said johnson in proper angle to toilet or urinal or open field.
Three flaws with this argument. Depending on the work he does, new construction leaves bare areas for the electricians to come in and do their wiring. However if he also does old construction than I can understand him laying a line to cut, say sheetrock or plaster board. 2nd flaw...why wouldn't his right hand also be covered with chalk. 3rd flaw, why didn't he bother to explain this to you. At the least when my H is proving his innocence, he will do leaps and bounds to illustrate where my logic is flawed. This excuse, if you use it though & then pretend to drop the matter, I'm sure he'll readily accept. Then you can lay low and investigate further, once he thinks he's in the clear again. Do try to observe him using the toilet & whether this is a technique he uses or not.
Now is he running scared? You betcha, because adultery is a cause for divorce in Conn & I think the underwear with other evidence could be added to the case, if D becomes something in the future...there also may be tell tale DNA left. Even if it's something you don't want, at this point you have to put D on the table as it proceeds to you gathering evidence.
And because it's a cause, it probably also comes into play as it regards child custody matters. Even when adultery isn't a cause in no fault states, it's always a good matter to bring up, since judges still don't take kindly to it.
Now I've given you an excuse you can use & tell him you thought through his explanation & realized you overreacted and the matters dropped. Only don't drop it and use it to rationalize or rugsweep. Again, based on my experiences, an innocent person would not have reacted, such as your husband has.
So one last thought. His employer. Yes, he could be using him as a smokescreen,lulling you into a false sense of security that the boss is so tight, that your H would never act out during work hours. If in fact, they actually have disclosed your husband may be "recorded", the most common thing they will do is put a GPS device on their vehicles...less of a chance there is actual recording of voices during the work day. If you get a chance, I'd definitely move the passenger seat to a position that makes it easier for you to observe if it's been moved. Mine is set to my petite frame and goes up quite far, so easy to look at from outside and see if it's been moved back. I have some more info to share which I will PM, since it's usually mentioned in the IT forum, which you won't have access to until you make more posts.
For right now, just know you'll get through this and take care of you and your children. A few years back there was a mother of five, who'd D'd her abusive husband and was able to relocate to a job as a nanny/housekeeper for a well off family & she reported she was happy as could be. So if the worst does come to pass, just know it's possible to reforge a new life for yourself.
Edited to add: you could run to a hardware store & buy some of that red chalk and see how it reacts to a washing. Also I posted in general a pretty good description on proving adultery in South Carolina. Do visit a lawyer cause all states are different, but it does give you an idea as to gathering evidence & what doesn't apply can be thrown out later.
http://www.survivinginfidelity.com/forums.asp?tid=456725
[This message edited by oldtimer97 at 10:40 AM, May 16th (Wednesday)]