Done, but I guess I can reply here, others may be interested.
Legality is going to vary by location and very likely by individual dumpster. My own tiny community of 2000 souls is pretty understanding and dumpster diving while against the law is completely accepted. I imagine that if you were being a pig and throwing trash out of said dumpster and someone happened to notice, the local police might ask you to pick it back up and move on but I seriously doubt they’d consider it an offense big enough to haul you to the lockup.
There are some common sense rules and tools that will make it safer and more profitable.
Know your dumpsters well and check them regularly. Know when they are emptied and when you can expect to find the best stuff. If it is a store dumpster, try to get to know the person that dumps the trash. Those folks would be your worst competitors if it didn’t threaten their jobs.
Never physically get into a dumpster while you are alone. 98% of your finds can be fished out from the outside.
Handy tools are a shovel, homemade trash picker (stick with a hook attached), gloves, four foot step ladder, boxes to hold your finds and rope to tie the stuff on your vehicle. Always carry your tools with you, because if you have to go get them, someone else will have made off with your goodies.
As noted above, be respectful and don’t leave a mess behind you. If I find other trash scattered about, I always pick it up.
If the dumpster is signed no dumping, park your vehicle and work from the other side so you can always claim you didn’t see it. If it is locked or if someone chases you away leave the darn thing alone and find more fertile ground, there are thousands of dumpsters.
Avoid turning your own place into a dump. Just keep the stuff that works or can be easily repaired. Store it neatly so your neighbors or roommates don’t have a problem with it.
Never brag too loud about your finds or you’ll soon have more competition than you need.
Day or night? Depends, I always do my diving openly in broad daylight, although if I thought someone would be offended, I’d go at night. I find that many folks realize that what they are discarding has value to someone and will simply put it next to the dumpster for the express purpose of someone else to see and utilize.
Here’s a picture of part of my cheese score.
By the way, I took the picture with the Kodak digital camera I found in a dumpster and just needed new batteries.
I’m pretty well beyond the need to dumpster dive but I do aspire to be frugal in all things and it is a great hobby! I am constantly amazed at the good stuff folks discard.