I hope tanto blades aren't illegal, because all my carry knives are tanto-bladed.
They aren't IF they do NOT have any portion of blade (opposite the main cutting edge) sharpened.
That does not include a "false edge".
The knife pictured above is not what one thinks of...when considering a "Tanto" anyway. It is some strange conglomeration of an "American Tanto" and a "Reverse Tanto".
Unless the secondary edge is indeed sharpened (allowing for back-cuts) then all that has been accomplished is to lower the point more along the center line.
I don't know if the treatment along the top of the blade (scalloped) is supposed to be an attempt at a blood groove...or is just there for more "aesthetics", but it significantly weakens the "spine" of the knife and doesn't make a good rest for the thumb when backing up the blade with a "Filipino Grip". Not that it matters, because they left the "flipper" right in the way too.
You can probably imagine how much fun it would be to sharpen (the amount of serration leaves only a small portion of normal edge before it makes the transition angle).
I know it looks "mean"....but IMO it would make a poor tactical knife except for thrusts/stabs...and even then...I see nothing about it that would make it excel.
I believe alot more effort went into it....to make it look cool...than practical thought. Just my .02
Flint.