If you talking about small game...the legal for electronic device reg. doesnt really apply as that ruling is simply for registering record book animals in P&Y ..Boone & Crockett ...etc in their record books...
Its in the same class as lumenocks or lighted sights..
The strink tracker that utilize a fishing line type string and reel have a small hook on the head that attaches on the entry...or even if it is attached to broadhead...the string/line doesnt really stay in the animal if animal breaks the string so its legal ...seen it used several times ...works well with bears...seen it used on an maginal hit elk and when elk reached end of track line it simply popped out ..
But again is legal used as directed...
The BowBug wouldnt reall help track the animal as most arrows pass thru or if arrow doesnt most times animal will break the arrow with the nock end being knocked out of the animal...so at best it will help you find your arrow...or broken arrow and nock...JMHO
the String tracker can effect arrow flight and is added weight and most times works only if animal goes down which is usually in sight...
As Lefty-Canuck nothing beats a good hit and watching animal go down big or small game ...hit in lower one third of body in vitals will produce more blood for trail anyone can follow...
there are devices like the game tracker that uses heat infered to track...but thats dicey at best also...
For small game the Zwicky Judo point does a quick job without loseing arrow or small game most times...
JMHO
Neil